Grand Cayman: Annual Weather Averages

August is the hottest month in Grand Cayman with an average temperature of 30°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
High °F 84 84 86 86 88 90 91 91 90 90 86 84
Low °C 21 21 21 22 23 24 24 26 26 23 24 22
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

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