August weather forecastSaint Helier, Jersey
August
Weather in August
August carries forward July's warm trend but with slightly decreasing temperatures. The city remains firmly within the grip of summer. Despite the reduction, rainfall amounts increase to 42mm (1.65"). As expected, daylight hours start to reduce but remain sufficient for outdoor activities. Saint Helier's weather remains delightful, with many continuing to savor the summer sun and warmer Sea temperatures.Temperature
Saint Helier's warmest weather arrives in August, when temperatures average a high of 18.2°C (64.8°F) and a low of 16.3°C (61.3°F).Humidity
The average relative humidity in August in Saint Helier is 81%.Rainfall
In Saint Helier, Jersey, in August, it is raining for 13.8 days, with typically 42mm (1.65") of accumulated precipitation. In Saint Helier, during the entire year, the rain falls for 189 days and collects up to 538mm (21.18") of precipitation.Snowfall
In Saint Helier, snow does not fall in April through October.Sea temperature
With an average sea temperature of 17°C (62.6°F), August is the month with the warmest seawater.Note: Swimming in water at 17°C (62.6°F) is not a pleasurable experience for most. The task of managing breathing becomes more challenging as the water temperature descends from 21°C (69.8°F) to 15°C (59°F).
Daylight
The average length of the day in August in Saint Helier is 14h and 21min.On the first day of August, sunrise is at 05:41 and sunset at 20:47. On the last day of the month, sunrise is at 06:24 and sunset at 19:53 BST.
Sunshine
In Saint Helier, the average sunshine in August is 9.3h.UV index
June through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The daily maximum UV index of 5 in August interprets into the following advice:
Put precautions into practice - Ensuring skin and eye safety is a necessity. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Saint Helier, Jersey
- Average high temperature in August: 18.2°C
The warmest month (with the highest average high temperature) is August (18.2°C).
The month with the lowest average high temperature is February (9°C).
- Average low temperature in August: 16.3°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (6.8°C).
Average pressure in August
Saint Helier, Jersey
- Average pressure in August: 1016.5mbar
The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1011.8mbar).
Average wind speed in August
Saint Helier, Jersey
- Average wind speed in August: 21km/h
The windiest month (with the highest average wind speed) is December (34km/h).
The calmest month (with the lowest average wind speed) is July (20.4km/h).
Average humidity in August
Saint Helier, Jersey
- Average humidity in August: 81%
The months with the highest relative humidity are June and July (83%).
The months with the lowest relative humidity are November and December (78%).
Average rainfall in August
Saint Helier, Jersey
- Average rainfall in August: 42mm
The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is July (25mm).
Average rainfall days in August
Saint Helier, Jersey
- Average rainfall days in August: 13.8 days
The month with the highest number of rainy days is November (21.2 days).
The months with the least rainy days are May and July (12.2 days).
Average snowfall in August
Saint Helier, Jersey
- Average snowfall in August: 0mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in August
Saint Helier, Jersey
- Average snowfall days in August: 0 days
The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in August
Saint Helier, Jersey
- Average sea temperature in August: 17°C
The best month for swimming (with the highest average sea temperature) is August (17°C).
The coldest months (with the lowest average sea temperature) are February and March (9°C).
Average daylight in August /
Average sunshine in August
Saint Helier, Jersey
- Average daylight in August: 14h and 18min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in August: 9h and 18min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and November (Average sunshine: 4h and 0min).
Average sunshine days in August
Saint Helier, Jersey
- Average sunshine days in August: 14.7 days
The month with the most sunshine days is May (16.8 days).
The month with the least sunshine days is November (5.8 days).
Average UV index in August
Saint Helier, Jersey
- Average UV index in August: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in August
Saint Helier, Jersey
- Average cloud cover in August: 39
The months with the most cloud cover are January, November and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in August
Saint Helier, Jersey
- Average visibility in August: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
