The weather in the Turks and Caicos Islands can be summarized as follows. May to October are the hot months, and November to April are the 'cool' months. However, the average monthly variation between the 'hot' and 'cool' months is only about 7° F, so the terms may be a bit of a misnomer.
Average temperature is 80.
There is generally little rainfall throughout the year, and you will probably get not even a drizzle while you are here. It's commonly said that there are 360 days of sunshine throughout the year, and that's a surprisingly accurate statement. The rainiest part of the year is roughly April - July.
Floods and heavy rains occur almost exclusivly during hurricane season. More rain can fall in a matter of hours than in the previous months.
Mosquitos, known locally as 'skeeters',
The Caribbean hurricane season is officially 1 June to 30 November. However, the majority of hurricanes that have hit the TCI have occured at end of August to mid-September. Hurricane Ike hit 6 Sep 2008, Hurricane Hanna 1 Sep 2008, Hurricane Donna 7 Sep 1960, Hurricane Frances 1 Sep 2004. Hurricane Kate (18 November, 1985) was a major exception.
Whilst it is rare for a serious hurricane to hit the Turks and Caicos Islands, it is much more common for flights to be reschdeulded due to the threat of one.
To avoid your holiday being ruined by a hurricane (or more likely, the chance of one), you may want to scheduling to avoid visiting between August 31 and September 15.
The average water temperature fluctuates less than air temperture, ranging from 79 in the winter to 84 in the summer.