The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. The horizon should be clearly defined and the brightest stars should be visible under good atmospheric conditions (i.e. 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). Find out more about our data sources. 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. 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. The shaded overlays indicate night and civil twilight. Live weather reports from Saint Helier weather stations and weather warnings that include risk of thunder, high UV index and forecast gales. 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. Lower dew points feel drier and higher dew points feel more humid. 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. Last 2 weeks of weather Wind, waves & weather forecast St Helier / Jersey, Jersey for kitesurfing, windsurfing, surfing & sailing no moonlight, or other lights). The sea is usually at its warmest in St Helier in August when the water temperature reaches 18°C. easyJet: Re-opened flight routes for 2021. 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. 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. 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. Within 80 kilometres contains only modest variations in elevation (300 metres). The time period when the sun is between 6 and 12 degrees below the horizon at either sunrise or sunset. 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. 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 chance of wet days in Saint Helier varies throughout the year. For the purposes of this report, the geographical coordinates of Saint Helier are 49.188 deg. Outlook for Saturday to Monday. The brightest day of the year is June 27, with an average of 6.8 kWh. 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. The figure below presents a compact representation of key lunar data for 2021. The December 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 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. The change in length of daylight between today and tomorrow is also listed when available. latitude, -2.105 deg. 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. Rain falls throughout the year in Saint Helier. Averages are for Jersey Airport, which is 4 miles from Saint Helier. Find out more about our data sources. 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 most rain falls during the 31 days centered around December 16, with an average total accumulation of 70 millimetres. Windy with periods of light rain. The hottest day of the year is August 3, with an average high of 21 °C and low of 15 °C. The average water temperature experiences extreme seasonal variation over the course of the year. The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year. 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 percentage of time spent in various temperature bands. 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. 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). Saint Helier experiences some seasonal variation in monthly rainfall. © Copyright TWC Product and Technology LLC 2014, 2021. Within 16 kilometres also contains only modest variations in elevation (140 metres). The predominant average hourly wind direction in Saint Helier varies throughout the year. 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. Windy with a few showers early then partly cloudy overnight. The number of hours during which the Sun is visible (black line). 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. High 43F. Providing you with a hyper-localized, minute-by-minute forecast for the next four hours. The smallest chance of a wet day is 16% on August 3. In Saint Helier, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year. The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds. The time of Civil Sunset minus the time of Civil Sunrise. The average hourly temperature, color coded into bands. Saint Helier, Jersey, Jersey Hourly Weather Forecast. 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 horizon is well defined and the outline of objects might be visible without artificial light. 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. 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. The time period when the sun is between 12 and 18 degrees below the horizon at either sunrise or sunset. 14-day weather forecast for St Helier. 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. Weather data is prone to errors, outages, and other defects. To characterize how pleasant the weather is in Saint Helier throughout the year, we compute two travel scores. 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. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. Metric (°C / mm) | … 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. The average temperature over the next 25 days in St Helier from this forecast is 9°C (48°F). Winds could occasionally gust over 40 mph. St Helier › South-East: Esplanade - Radisson Blu Waterfront Hotel, Jersey - Waterfront Underground Carpark - Jersey (St Helier) - Saint Helier - Jersey 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. Annual Weather Averages Near Saint Helier. The time of Actual Sunset minus the time of Actual Sunrise. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. 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. The thin dotted lines are the corresponding average perceived temperatures. The drier season lasts 6.5 months, from March 13 to September 27. The warm season lasts for 3.1 months, from June 16 to September 21, with an average daily high temperature above 18 °C. 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. Get the monthly weather forecast for Saint Helier, Saint Helier, Jersey, including daily high/low, historical averages, to help you plan ahead. Chance of rain 30%. The beach/pool score favors clear, rainless days with perceived temperatures between 24 °C and 32 °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). Chance of rain 70%. Find out more about our data sources. The black line is the percentage chance that a given day is within the growing season. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. 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. Up to 90 days of daily highs, lows, and precipitation chances. Animated forecast maps with rain, wind, satellite and … The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands. 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. 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 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 shaded overlays indicate night and civil twilight. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . Time zones for airports and weather stations are provided by AskGeo.com . 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 of year with cooler water lasts for 3.8 months, from January 1 to April 25, with an average temperature below 10 °C. The day of the year with the warmest water is August 26, with an average temperature of 18 °C. The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands. This section reports on the wide-area average surface temperature of that water. 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 solar day over the course of the year 2021. A wet day is one with at least 1 millimetre of liquid or liquid-equivalent precipitation. The clearer part of the year in Saint Helier begins around May 8 and lasts for 5.1 months, ending around October 11. One still should be able to carry on ordinary outdoor activities. Check out the Saint Helier, Saint Helier, Jersey MinuteCast forecast. Click on each chart for more information. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Saint Helier area. Take control of your data. You are about to report this weather station for bad data. 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 Based on weather reports collected during 1985–2015. The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Please select the information that is incorrect. The least rain falls around August 2, with an average total accumulation of 29 millimetres. The darkest day of the year is December 27, with an average of 0.8 kWh. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 metres above the ground. 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. We will review the data in question. 14 day weather in Saint Helier. 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 coldest day of the year is February 8, with an average low of 5 °C and high of 8 °C. The cloudier part of the year begins around October 11 and lasts for 6.9 months, ending around May 8. Winds could occasionally gust over 40 mph. There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Saint Helier. The tourism score favors clear, rainless days with perceived temperatures between 18 °C and 27 °C. Winds W at 25 to 35 mph. 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. When is the sea warmest in St Helier? Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Thank you for reporting this station. 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