Cornwall, United Kingdom: Annual Weather Averages

July is the hottest month in Cornwall with an average temperature of 16°C (61°F) and the coldest is February at 5.5°C (42°F) with the most daily sunshine hours at 7 in August. The wettest month is December with an average of 120mm of rain. The best month to swim in the sea is in August when the average sea temperature is 17°C (63°F).

Average Temperature: Cornwall

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6 6 7 8 11 14 16 16 15 12 9 8
°F 43 42 45 46 52 56 61 61 58 54 48 46

Average High/Low Temperature: Cornwall

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High °C 8 8 9 11 14 16 19 19 17 14 11 9
Low °C 4 3 5 5 8 11 13 13 12 10 7 6
High °F 46 46 48 52 57 61 66 66 63 57 52 48
Low °F 39 37 41 41 46 52 55 55 54 50 45 43

Average Rainfall: Cornwall

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 110 90 100 60 60 70 60 60 70 110 100 120
Days 25 21 22 20 18 19 20 21 19 23 25 23

Average Daily Sunshine Hours: Cornwall

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hours 2 3 4 6 7 7 7 7 5 4 3 2

Average Sea Temperature: Cornwall

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 10 9 9 10 11 13 16 17 16 14 12 11
°F 50 48 48 50 52 55 61 63 61 57 54 52

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