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St Helier weather in August 2025
Expect 20°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in St Helier in August. Check more long-term weather averages for St Helier in August before you book your next holiday to Jersey in 2025/2026.
- 20°C max day temperature
20 - 8 hours of sunshine per day
- 11 days with some rainfall
11 - 14°C min night temperature
14 - 14 hours of daylight per day
14 - No heat & humidity
0 - 52 mm of monthly rainfall
52 - 6 (High) UV index
6 - 18°C sea temperature
18
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The August weather guide for Jersey, represented by St Helier, (St Helier) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C / mm) | Imperial (°F / inches)
How hot is it in St Helier in August?
Daytime temperatures usually reach 20°C in St Helier in August, falling to 14°C at night.
How sunny is it in St Helier in August?
There are normally 8 hours of bright sunshine each day in St Helier in August - that's 52% of daylight hours.
How warm is the sea around St Helier in August?
The average sea temperature around St Helier in August is 18°C.
Does it rain in St Helier in August?
There are usually 11 days with some rain in St Helier in August and the average monthly rainfall is 52mm.
St Helier August sunrise & sunset times
Browse the sunrise and sunset times for St Helier in August 2025. Select a month to view St Helier sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Friday, 1st August 2025 | 04:41 | 19:48 |
| Saturday, 16th August 2025 | 05:02 | 19:22 |
| Sunday, 31st August 2025 | 05:23 | 18:53 |
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