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 |
