St Helier, United Kingdom: Annual Weather Averages
July is the hottest month in St Helier with an average temperature of 16.5°C (62°F) and the coldest is January at 5.5°C (42°F) with the most daily sunshine hours at 8 in July. The wettest month is November with an average of 66.8mm of rain. The best month to swim in the sea is in September when the average sea temperature is 17.4°C (63°F).
Average Temperature: St Helier
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 6 | 6 | 8 | 9 | 12 | 14 | 17 | 17 | 16 | 13 | 9 | 7 |
| °F | 42 | 42 | 46 | 47 | 53 | 57 | 62 | 62 | 60 | 55 | 48 | 45 |
Average High/Low Temperature: St Helier
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | 7 | 7 | 9 | 11 | 14 | 16 | 19 | 19 | 18 | 14 | 10 | 8 |
| Low °C | 4 | 4 | 6 | 6 | 9 | 12 | 14 | 14 | 13 | 11 | 8 | 6 |
| High °F | 45 | 45 | 48 | 52 | 57 | 61 | 66 | 66 | 64 | 57 | 50 | 46 |
| Low °F | 39 | 39 | 43 | 43 | 48 | 54 | 57 | 57 | 55 | 52 | 46 | 43 |
Average Rainfall: St Helier
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 65 | 45 | 30 | 40 | 22 | 37 | 27 | 29 | 42 | 51 | 67 | 58 |
| Days | 22 | 20 | 21 | 19 | 16 | 16 | 17 | 16 | 17 | 22 | 23 | 23 |
Average Daily Sunshine Hours: St Helier
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours | 2 | 3 | 4 | 6 | 7 | 8 | 8 | 7 | 6 | 4 | 3 | 2 |
Average Sea Temperature: St Helier
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 10 | 10 | 9 | 10 | 12 | 14 | 16 | 17 | 17 | 16 | 14 | 12 |
| °F | 50 | 49 | 49 | 51 | 53 | 57 | 60 | 63 | 63 | 62 | 58 | 54 |
