Cozumel Weather

Cozumel has tropical savanna climate under the Köppen climate classification that closely borders on a tropical monsoon climate. The dry season is short, from February to April, but even in these months precipitation is observed, averaging about 45 millimeters (1.8 in) of rain per month. The wet season is lengthy, covering most of the months, with September and October being the wettest months, when precipitation averages over 240 millimeters (9.4 in). Thunderstorms can occasionally occur during the wet season. Temperatures tend to remain stable with little variation from month to month though the temperatures are cooler from December to February with the coolest month averaging 22.9 °C (73.2 °F). Owing to its proximity to the sea, the island is fairly humid, with an average humidity of 83%. The wettest recorded month was October 1980 with 792 millimeters (31.2 in) of precipitation and the wettest recorded day was June 19, 1975, with 281 millimeters (11.1 in). Extremes range from 9.2 °C (48.6 °F) on January 18, 1977 to 39.2 °C (102.6 °F).