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
High °F 45 45 48 52 57 61 66 66 64 57 50 46
Low °C 4 4 6 6 9 12 14 14 13 11 8 6
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

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