The average temperature for Cozumel is eighty five degrees most days, dropping to seventy degrees at night. The hottest month is August which averages eighty degrees at night and ninety five degrees during the day. Although the days can be hot and humid, the heat is offset by ocean breezes. The rainy season in Cozumel starts in late summer or early fall. Mid-fall is the time that hurricanes are likely to occur.
The average daily air temperature on Cozumel is 80 to 85 degrees (27°C to 28°C).
Cozumel is one of the hottest, most tropical climates in Mexico.
From June to August, humidity is very high and temperatures range from the upper 80s to the low 90s (32°C).
In December and January, the daytime temperatures average in the mid-70s.(24° C.)
Rainy season begins in May and can last until mid-October. Late afternoon showers are short.
Water temperatures range from 77°-82°F (25°-28°C) throughout the year.