The temperatures in St. Thomas in September are usually low and can range between 11°C and 18°C.
You can expect about 3 to 8 days of rain in St. Thomas during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in St. Thomas in September 2025.
If you’re planning to visit St. Thomas in the near future, we highly recommend that you review the 14 day weather forecast for St. Thomas before you arrive.
Temperatures
18° / 11°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
61
mm
Sun Hours
9.2
Hrs
