February is one of the coolest months in the Caribbean, but don't worry, it's still warm enough to get a great tan. Daytime temperatures usually hover around the mid-70s to mid-80s Fahrenheit (23-30°C), while nighttime temperatures can dip to the mid-60s to mid-70s Fahrenheit (18-23°C). Yes, it's chilly enough to need a light sweater, but who needs a sweater when you have rum punch?
The Caribbean is a big place, and the weather can vary from island to island. The northern islands, like the Bahamas and Turks and Caicos, tend to be a bit cooler than the southern islands, like Aruba and Barbados. But hey, who's complaining when the average temperature is still a lovely 78°F (25°C)?