St. Thomas
September
Weather in St. Thomas for September 2025
Your guide to St. Thomas weather in September - trends and predictions
In general, the average temperature in St. Thomas at the beginning of September is 26.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.7 °C by the end of September.
With an average of 4 rainy days, St. Thomas experiences minimal rainfall in September, ensuring that most days remain pleasantly dry.
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26
Dry days
4
Rainy days
0
Snow days
25°/12°
Temperatures
20 km/h
Avg max wind
72 %
Avg humidity
St. Thomas in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2  23° | 3 29° | 4 31° | 5 31° | 6 27° | 7  21° |
| 8  21° | 9 25° | 10 26° | 11 28° | 12  25° | 13 23° | 14 25° |
| 15 27° | 16 28° | 17  24° | 18 23° | 19 22° | 20 24° | 21 24° |
| 22 24° | 23 23° | 24 22° | 25 23° | 26 23° | 27 21° | 28 18° |
| 29 22° | 30 23° |
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Temperatures trend during September in St. Thomas
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Partly cloudy | 24° /11° | 0.1 mm | 6 | |
| 2 Sept. | Fog | 23° /10° | 0 mm | 6 | |
| 3 Sept. | Mist | 29° /12° | 0 mm | 7 | |
| 4 Sept. | Partly cloudy | 31° /14° | 0 mm | 8 | |
| 5 Sept. | Mist | 31° /16° | 0 mm | 8 | |
| 6 Sept. | Fog | 27° /16° | 9.1 mm | 6 | |
| 7 Sept. | Light rain shower | 21° /11° | 4.5 mm | 5 | |
| 8 Sept. | Overcast | 21° /9° | 0 mm | 5 | |
| 9 Sept. | Overcast | 25° /11° | 0 mm | 6 | |
| 10 Sept. | Overcast | 26° /11° | 0 mm | 6 | |
| 11 Sept. | Overcast | 28° /12° | 0.1 mm | 7 | |
| 12 Sept. | Moderate or heavy rain shower | 25° /13° | 7.8 mm | 6 | |
| 13 Sept. | Overcast | 23° /12° | 0 mm | 6 | |
| 14 Sept. | Mist | 25° /11° | 0 mm | 7 | |
| 15 Sept. | Partly cloudy | 27° /11° | 0 mm | 7 | |
| 16 Sept. | Mist | 28° /10° | 0 mm | 7 | |
| 17 Sept. | Patchy light drizzle | 24° /12° | 0.4 mm | 5 | |
| 18 Sept. | Fog | 23° /10° | 0 mm | 5 | |
| 19 Sept. | Fog | 22° /10° | 0 mm | 5 | |
| 20 Sept. | Overcast | 24° /10° | 0 mm | 5 | |
| 21 Sept. | Fog | 24° /14° | 4.6 mm | 6 | |
| 22 Sept. | Partly cloudy | 24° /14° | 0 mm | 6 | |
| 23 Sept. | Mist | 23° /13° | 18.3 mm | 5 | |
| 24 Sept. | Overcast | 22° /13° | 0 mm | 5 | |
| 25 Sept. | Partly cloudy | 23° /13° | 5.3 mm | 6 | |
| 26 Sept. | Overcast | 23° /12° | 0 mm | 5 | |
| 27 Sept. | Overcast | 21° /9° | 0 mm | 5 | |
| 28 Sept. | Light rain shower | 18° /13° | 1.5 mm | 4 | |
| 29 Sept. | Patchy rain possible | 22° /13° | 0 mm | 5 | |
| 30 Sept. | Mist | 23° /14° | 0 mm | 6 | |
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Important Notice
Our weather forecast for St. Thomas in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the St. Thomas forecast closer to your planned date for the most up-to-date weather information.
St. Thomas in September - FAQ
What are the expected maximum and minimum temperatures in St. Thomas during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in St. Thomas during September?
In September, St. Thomas can expect light to moderate rainfall, totaling 28.4 mm across approximately 4 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in St. Thomas during September?
The average wind speed in St. Thomas during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in St. Thomas
Explore the daily rainfall trends and prepare for St. Thomass September weather 💧
UV exposure in St. Thomas during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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