Outside of hurricane season and rainy season, you can expect incredible weather the entire time you're in Turks and Caicos. Of course, every now and then, a hurricane or tropical storm passes through the Caribbean, but you won't have to worry about those if you avoid visiting between June and November. For the most part, you can expect a high average temperature with fluctuations of only a few degrees, sunny days, and very occasional rain showers. Caribbean weather is fairly predictable - you can predict that it will be nice pretty much all of the time.