Grand Cayman, Cayman Islands: Annual Weather Averages
August is the hottest month in Grand Cayman with an average temperature of 29.5°C (85°F) and the coldest is January at 25°C (77°F) with the most daily sunshine hours at 11 in July. The wettest month is October with an average of 220mm of rain. The best month to swim in the sea is in September when the average sea temperature is 30°C (86°F).
Average Temperature: Grand Cayman
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 25 | 25 | 26 | 26 | 27 | 28 | 29 | 30 | 29 | 28 | 27 | 26 |
| °F | 77 | 77 | 78 | 79 | 81 | 82 | 83 | 85 | 84 | 82 | 81 | 78 |
Average High/Low Temperature: Grand Cayman
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | 29 | 29 | 30 | 30 | 31 | 32 | 33 | 33 | 32 | 32 | 30 | 29 |
| Low °C | 21 | 21 | 21 | 22 | 23 | 24 | 24 | 26 | 26 | 23 | 24 | 22 |
| High °F | 84 | 84 | 86 | 86 | 88 | 90 | 91 | 91 | 90 | 90 | 86 | 84 |
| Low °F | 70 | 70 | 70 | 72 | 73 | 75 | 75 | 79 | 79 | 73 | 75 | 72 |
Average Rainfall: Grand Cayman
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 90 | 60 | 20 | 40 | 100 | 140 | 90 | 120 | 130 | 220 | 120 | 90 |
| Days | 8 | 5 | 6 | 4 | 11 | 11 | 9 | 14 | 13 | 14 | 10 | 11 |
Average Daily Sunshine Hours: Grand Cayman
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours | 8 | 9 | 9 | 10 | 10 | 10 | 11 | 10 | 9 | 8 | 8 | 8 |
Average Sea Temperature: Grand Cayman
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 27 | 27 | 27 | 28 | 28 | 29 | 29 | 30 | 30 | 29 | 29 | 28 |
| °F | 80 | 80 | 80 | 82 | 83 | 84 | 85 | 86 | 86 | 85 | 83 | 82 |
