What's the weather like in January? We are going to Cozumel January 7th /2004. Should we bring with us sweaters for the evening, jeans? Last time I heard a couple were in Cancun around this time, the weather was chilly...Thanks for any info.

We are going on a cruise in mid March. We are porting in Cozumel and Costa Mia.
Please help me know what the weather will be like. Is it chilly at night?
Thank you for any information.
C. McGuire