Between the months of November and February, the climate in Cozumel is quite pleasant, allowing you to enjoy the sun and the beaches without suffering from excessive heat.
Due to the ideal conditions, you will likely spend more as the dates enter peak season.
From March to June, temperatures start to rise and there are likely to be showers in the late afternoon. These months are considered the “low season” on the island, which is why you will find great deals.
From July to the end of October, Cozumel's peak tourist season is the rainy season for the region, which increases the likelihood of encountering a storm on your vacation.
Remember that it is hurricane season in the Caribbean, and if there is a threat, Cozumel is always the first place affected.
If you can choose, I would recommend avoiding these months, as being a destination where the charm lies in its beaches and the wonderful marine fauna of the region, it will not be easy to enjoy it if it rains a lot.
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