July weather forecastSaint Helier, Jersey
July
Weather in July
In July, Saint Helier experiences the peak of summer. The city enjoys its warmest month with the mercury hitting the maximum level of 17.6°C (63.7°F). The rainfall amounts drop, making July one of the driest months. The increased daylight and sunlit hours further amplify summer's appearance. It is an ideal time to explore the city's beaches and partake in water-bound activities.Temperature
The transition into July notes an average high-temperature of a still refreshing 17.6°C (63.7°F), revealing a mild distinction from the 15.8°C (60.4°F) in June. Saint Helier's July nights experience a subtle temperature dip to an average of 15.6°C (60.1°F).Humidity
June and July, with an average relative humidity of 83%, are the most humid months.Rainfall
The month with the least rainfall is July, when the rain falls for 12.2 days and typically collects 25mm (0.98") of precipitation.Snowfall
In Saint Helier, snow does not fall in April through October.Sea temperature
In July, the average sea temperature is 16°C (60.8°F).Note: Swimming is not a pleasant activity for most individuals in 16°C (60.8°F). Breathing becomes increasingly challenging to control as the water temperature dips from 21°C (69.8°F) to 15°C (59°F).
Daylight
The average length of the day in July in Saint Helier is 15h and 45min.On the first day of the month, sunrise is at 05:07 and sunset at 21:17. On the last day of July, sunrise is at 05:40 and sunset at 20:49 BST.
Sunshine
With an average of 9.7h of sunshine, July has the most sunshine of the year in Saint Helier.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: An average UV index of 5 in July transforms into this advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Saint Helier, Jersey
- Average high temperature in July: 17.6°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 July: 15.6°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 July
Saint Helier, Jersey
- Average pressure in July: 1016.8mbar
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 July
Saint Helier, Jersey
- Average wind speed in July: 20.4km/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 July
Saint Helier, Jersey
- Average humidity in July: 83%
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 July
Saint Helier, Jersey
- Average rainfall in July: 25mm
The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is July (25mm).
Average rainfall days in July
Saint Helier, Jersey
- Average rainfall days in July: 12.2 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 July
Saint Helier, Jersey
- Average snowfall in July: 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 July
Saint Helier, Jersey
- Average snowfall days in July: 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 July
Saint Helier, Jersey
- Average sea temperature in July: 16°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 July /
Average sunshine in July
Saint Helier, Jersey
- Average daylight in July: 15h and 42min
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 July: 9h and 42min
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 July
Saint Helier, Jersey
- Average sunshine days in July: 16.4 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 July
Saint Helier, Jersey
- Average UV index in July: 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 July
Saint Helier, Jersey
- Average cloud cover in July: 37
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 July
Saint Helier, Jersey
- Average visibility in July: 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).
