See the links below the 12-day Saint Helier weather forecast table for other cities and towns nearby along with weather conditions for local outdoor activities. For the purposes of this report, the geographical coordinates of Saint Helier are 49.188 deg. The wind is most often from the west for 12 months, from October 31 to October 24, with a peak percentage of 36% on January 1. Chance of rain 70%. This report illustrates the typical weather in Saint Helier, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Saint Helier is located near a large body of water (e.g., ocean, sea, or large lake). In 2021, the shortest day is December 21, with 8 hours, 12 minutes of daylight; the longest day is June 21, with 16 hours, 14 minutes of daylight. Weather data is prone to errors, outages, and other defects. The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands. You are about to report this weather station for bad data. The transitions to and from daylight saving time are indicated by the 'DST' labels. Outlook for Saturday to Monday. The chance of a wet day peaks at 38% on December 12. The sea is usually at its warmest in St Helier in August when the water temperature reaches 18°C. The earliest sunrise is at 5:02 a.m. on June 16, and the latest sunrise is 3 hours, 1 minute later at 8:03 a.m. on December 31. The average temperature over the next 25 days in St Helier from this forecast is 9°C (48°F). The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands. Rain falls throughout the year in Saint Helier. The beach/pool score favors clear, rainless days with perceived temperatures between 24 °C and 32 °C. Find out more about our data sources. We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 1 millimetre of precipitation or more. Based on the tourism score, the best time of year to visit Saint Helier for warm-weather activities is from late June to mid September. The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year. The cool season lasts for 3.9 months, from November 25 to March 21, with an average daily high temperature below 11 °C. Check out the Saint Helier, Saint Helier, Jersey MinuteCast forecast. The time of Civil Sunset minus the time of Civil Sunrise. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 38% on December 12. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed. The average hourly temperature, color coded into bands. For each station, the records are corrected for the elevation difference between that station and Saint Helier according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. The least rain falls around August 2, with an average total accumulation of 29 millimetres. Over the course of the year, the temperature typically varies from 5 °C to 21 °C and is rarely below 0 °C or above 25 °C. Up to 90 days of daily highs, lows, and precipitation chances. Saint Helier Weather Forecasts. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. The darkest day of the year is December 27, with an average of 0.8 kWh. To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Based on this score, the best time of year to visit Saint Helier for hot-weather activities is from mid July to mid August, with a peak score in the first week of August. There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Saint Helier. This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The drier season lasts 6.5 months, from March 13 to September 27. support@__remove_this_part__weatherspark.com. The April weather guide for St Helier, Jersey shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies. Metric (°C / mm) | … Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Saint Helier area. The calmer time of year lasts for 6.0 months, from April 4 to October 6. Winds could occasionally gust over 40 mph. In Saint Helier, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year. The time of year with warmer water lasts for 3.2 months, from July 9 to October 16, with an average temperature above 16 °C. Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 0 °C) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). The percentage of time spent in various temperature bands. The topography within 3 kilometres of Saint Helier contains only modest variations in elevation, with a maximum elevation change of 102 metres and an average elevation above sea level of 30 metres. Our beach/pool temperature score is 0 for perceived temperatures below 18 °C, rising linearly to 9 for 24 °C, to 10 for 28 °C, falling linearly to 9 for 32 °C, and to 1 for 38 °C or hotter. Find out more about our data sources. Take control of your data. The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds. The time of Actual Sunset minus the time of Actual Sunrise. The estimated value at Saint Helier is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Saint Helier and a given station. Time zones for airports and weather stations are provided by AskGeo.com . Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night. Daylight saving time (DST) is observed in Saint Helier during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31. The day of the year with the warmest water is August 26, with an average temperature of 18 °C. Winds NNW at 25 to 35 mph. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The average water temperature experiences extreme seasonal variation over the course of the year. The time period when the sun is no more than 6 degrees below the horizon at either sunrise or sunset. Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. Saint Helier, Jersey, Jersey Hourly Weather Forecast. latitude, -2.105 deg. The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. To characterize how pleasant the weather is in Saint Helier throughout the year, we compute two travel scores. The percentage of time spent at various humidity comfort levels, categorized by dew point. A wet day is one with at least 1 millimetre of liquid or liquid-equivalent precipitation. Windy with periods of light rain. Lower dew points feel drier and higher dew points feel more humid. Based on growing degree days alone, the first spring blooms in Saint Helier should appear around April 30, only rarely appearing before April 11 or after May 19. The most rain falls during the 31 days centered around December 16, with an average total accumulation of 70 millimetres. The stations contributing to this reconstruction are: Jersey Airport (90%, 7 kilometres, west); Dinard–Pleurtuit–Saint-Malo Airport (5%, 67 kilometres, south); and Cherbourg – Maupertus Airport (4.9%, 69 kilometres, northeast). The windiest day of the year is January 1, with an average hourly wind speed of 30.1 kilometres per hour. The time of year with cooler water lasts for 3.8 months, from January 1 to April 25, with an average temperature below 10 °C. In this report, we use a base of 10 °C and a cap of 30 °C. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. This section reports on the wide-area average surface temperature of that water. 14-day weather forecast for St Helier. The wetter season lasts 5.5 months, from September 27 to March 13, with a greater than 27% chance of a given day being a wet day. Long Beach, Washington, United States (8,015 kilometres away) and Picton, New Zealand (19,107 kilometres) are the far-away foreign places with temperatures most similar to Saint Helier (view comparison). For each hour between 8:00 a.m. and 9:00 p.m. of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. longitude, and 11 m elevation. easyJet: Re-opened flight routes for 2021. The average hourly wind speed in Saint Helier experiences significant seasonal variation over the course of the year. The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands. St Helier 7 day weather forecast including weather warnings, temperature, rain, wind, visibility, humidity and UV We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. Saint Helier Extended Forecast with high and low temperatures. Annual Weather Averages Near Saint Helier. The time period when the sun is between 6 and 12 degrees below the horizon at either sunrise or sunset. Ordinary outdoor activities are not possible at this time without extra illumination. Last 2 weeks of weather The day of the year with the coolest water is March 1, with an average temperature of 8 °C. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 metres above the ground. The perceived humidity level in Saint Helier, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout. We recognize our responsibility to use data and technology for good. In the beginning of morning astronomical twilight and at the end of astronomical twilight in the evening, sky illumination is very faint, and might be undetectable. The thin dotted line is the corresponding average liquid-equivalent snowfall. The figure below shows you a compact characterization of the entire year of hourly average temperatures. Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC. Shortwave radiation includes visible light and ultraviolet radiation. All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. Thank you for reporting this station. The chance of wet days in Saint Helier varies throughout the year. Be prepared with the most accurate 10-day forecast for Saint Helier, Jersey with highs, lows, chance of precipitation from The Weather Channel and Weather.com The smallest chance of a wet day is 16% on August 3. Winds could occasionally gust over 40 mph. St Helier Weather Forecast, United Kingdom The warmest day over the next 25 days weather in St Helier is forecast to be Tuesday 12th January 2021 at 12°C (54°F) and the warmest night on Wednesday 13th January 2021 at 10°C (50°F). The length of the day in Saint Helier varies extremely over the course of the year. The figure below presents a compact representation of key lunar data for 2021. The brightest day of the year is June 27, with an average of 6.8 kWh. Live weather reports from Saint Helier weather stations and weather warnings that include risk of thunder, high UV index and forecast gales. Wind, waves & weather forecast St Helier / Jersey, Jersey for kitesurfing, windsurfing, surfing & sailing Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The predominant average hourly wind direction in Saint Helier varies throughout the year. We assume no responsibility for any decisions made on the basis of the content presented on this site. The growing season in Saint Helier typically lasts for 10 months (314 days), from around February 12 to around December 24, rarely starting after March 19, or ending before November 22. The sunniest time of year in St Helier is normally July with bright sunshine on average for 53 % of daylight hours; that's 8 hours of sunshine per day. The darker period of the year lasts for 3.8 months, from October 26 to February 19, with an average daily incident shortwave energy per square meter below 2.0 kWh. Get the forecast for today, tonight & tomorrow's weather for Saint Helier, Saint Helier, Jersey. High 43F. The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The January weather guide for St Helier, Jersey shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Animated forecast maps with rain, wind, satellite and … The shaded overlays indicate night and civil twilight. Based on weather reports collected during 1985–2015. 14 day weather in Saint Helier. The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. The area within 3 kilometres of Saint Helier is covered by water (42%), trees (24%), and grassland (16%), within 16 kilometres by water (92%), and within 80 kilometres by water (71%) and cropland (13%). Please select the information that is incorrect. On December 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 64% of the time, and clear, mostly clear, or partly cloudy 36% of the time. The horizon should be clearly defined and the brightest stars should be visible under good atmospheric conditions (i.e. The tourism score favors clear, rainless days with perceived temperatures between 18 °C and 27 °C. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . When is the sea warmest in St Helier? The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than. © Copyright TWC Product and Technology LLC 2014, 2021. Hi/Low, RealFeel®, precip, radar, & everything you need to be ready for the day, commute, and weekend! The wind is most often from the south for 1.0 weeks, from October 24 to October 31, with a peak percentage of 33% on October 29. Know what's coming with AccuWeather's extended daily forecasts for Saint Helier, Saint Helier, Jersey. no moonlight, or other lights). Within 80 kilometres contains only modest variations in elevation (300 metres). Saturday will start dull and wet, but becoming dry with bright spells in the afternoon. Saint Helier experiences some seasonal variation in monthly rainfall. The black line is the percentage chance that a given day is within the growing season. The hottest day of the year is August 3, with an average high of 21 °C and low of 15 °C. Within 16 kilometres also contains only modest variations in elevation (140 metres). The change in length of daylight between today and tomorrow is also listed when available. Windy with a few showers early then partly cloudy overnight. Low 38F. The coldest day of the year is February 8, with an average low of 5 °C and high of 8 °C. The windier part of the year lasts for 6.0 months, from October 6 to April 4, with average wind speeds of more than 24.1 kilometres per hour. The time period when the sun is between 12 and 18 degrees below the horizon at either sunrise or sunset. Winds W at 25 to 35 mph. Click on each chart for more information. The thin dotted lines are the corresponding average perceived temperatures. Find out more about our data sources. The sun does not contribute to the illumination of the sky before this time in the morning, or after this time in the evening. The solar day over the course of the year 2021. The warm season lasts for 3.1 months, from June 16 to September 21, with an average daily high temperature above 18 °C. The horizon is well defined and the outline of objects might be visible without artificial light. The earliest sunset is at 4:10 p.m. on December 11, and the latest sunset is 5 hours, 8 minutes later at 9:17 p.m. on June 25. The June weather guide for St Helier, Jersey shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day). Based on this score, the best time of year to visit Saint Helier for general outdoor tourist activities is from late June to mid September, with a peak score in the last week of July. On July 18, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 61% of the time, and overcast or mostly cloudy 39% of the time. Averages are for Jersey Airport, which is 4 miles from Saint Helier. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. Find out more about our data sources. We will review the data in question. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . Our tourism temperature score is 0 for perceived temperatures below 10 °C, rising linearly to 9 for 18 °C, to 10 for 24 °C, falling linearly to 9 for 27 °C, and to 1 for 32 °C or hotter. The shaded overlays indicate night and civil twilight. In Saint Helier, the summers are comfortable and windy; the winters are long, cold, and extremely windy; and it is partly cloudy year round. The calmest day of the year is August 5, with an average hourly wind speed of 18.2 kilometres per hour. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. The clearer part of the year in Saint Helier begins around May 8 and lasts for 5.1 months, ending around October 11. The cloudier part of the year begins around October 11 and lasts for 6.9 months, ending around May 8. The brighter period of the year lasts for 3.3 months, from May 7 to August 17, with an average daily incident shortwave energy per square meter above 5.6 kWh. Chance of rain 30%. This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Get the monthly weather forecast for Saint Helier, Saint Helier, Jersey, including daily high/low, historical averages, to help you plan ahead. In Saint Helier, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.. MERRA-2 Modern-Era Retrospective Analysis. St Helier › South-East: Esplanade - Radisson Blu Waterfront Hotel, Jersey - Waterfront Underground Carpark - Jersey (St Helier) - Saint Helier - Jersey Providing you with a hyper-localized, minute-by-minute forecast for the next four hours. The number of hours during which the Sun is visible (black line). While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. One still should be able to carry on ordinary outdoor activities. 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