June is the hottest month in Cayo Guillermo with an average temperature of 28°C (82°F) and the coldest is January at 22°C (72°F) with the most daily sunshine hours at 9 in April. The wettest month is October with an average of 182mm of rain. The best month to swim in the sea is in August when the average sea temperature is 30°C (86°F).
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Sunrise 06:32
Sunset 17:30
Sunrise 06:32
Sunset 17:30