Weather in the USVI in September

September is Caribbean off season, but it's the high season for turbulent tropical weather, and vacationers may want to do a little extra checking before they make their trip to the Virgin Islands. However, travelers can also rest assured that severe storms rarely pass by these islands, and it's rare to have more than a few days of wet weather during the month of September on the island of St. Thomas, where these averages were taken.

Typical Weather in September

Temperatures in the Virgin Islands during September generally vary between an average high during the day of 89.0 degrees and an average low at night of 79.0 degrees


The Virgin Islands in September: Key Facts
Monthly Averages
High Low Rainfall
No. of Days
with Rain
89.0° F 79.0° F N.A. 5.0

On a typical September day, during the early morning hours you will probably find the temperature will be around 82.5 degrees. The temperature will rise over the course of the typical September day, reaching somewhere around 87.1 degrees by early afternoon. By the early evening hours in September the temperature will generally fall to somewhere in the vicinity of 80.5 degrees. For the month of September as a whole, temperatures in the Virgin Islands average around 84.2 degrees.


September Temperatures in The Virgin Islands by Time of Day
Early Morning Late Morning Early Afternoon Late Afternoon Early Evening Overall
82.5° F 86.7° F 87.1° F 84.5° F 80.5° F 84.2° F


Rain is most likely to occur around 11:00 PM during the month of September, and it is least likely to occur around 5:00 PM . In the Virgin Islands during September, thunderstorms -- when they occur -- are most likely sometime around 5:00 PM .


September Rainfall in The Virgin Islands by Time of Day
  Percent Frequencies of Hourly Observations
Hour Rain
2:00 AM # #
5:00 AM # #
8:00 AM 2 % 0.2 %
11:00 AM 3.3 % 0.4 %
2:00 PM 3.3 % 0.4 %
5:00 PM 1.6 % 0.5 %
8:00 PM 1.9 % 0.4 %
11:00 PM 3.8 % 0 %
ALL 2.7 % 0.4 %


Help us improve! We welcome your corrections and suggestions.