Saint Thomas Island (Saint Thomas)
September
Weather in Saint Thomas Island for September 2025
Your guide to Saint Thomas Island weather in September - trends and predictions
Hydrologic Outlook - See hour by hour.
Until now, September 2025 in Saint Thomas Island has been nearly identical to the historical average, with a temperature of 29.3 °C (showing only a slight deviation of -0.1 °C).
The forecast for the next days in Saint Thomas Island predicts temperatures to be around 29 °C, close to the historical average.
In general, the average temperature in Saint Thomas Island at the beginning of September is 29.4 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 29.3 °C by the end of September.
Saint Thomas Island in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 203.8 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
10
Dry days
20
Rainy days
0
Snow days
29°/28°
Temperatures
25 km/h
Avg max wind
77 %
Avg humidity
Saint Thomas Island Weather September
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What’s the Weather Like in Saint Thomas Island This September?
Discover the average temperatures and weather trends across Saint Thomas Island’s cities this September.
Temperatures trend during September in Saint Thomas Island
See the weather trend as well as the moving average line
September weather in Saint Thomas Island day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 29° /28° | 0.5 mm | 7 | |
| 2 Sept. | Light rain shower | 30° /28° | 4.1 mm | 7 | |
| 3 Sept. | Light rain shower | 30° /28° | 1.6 mm | 7 | |
| 4 Sept. | Light rain shower | 30° /28° | 0.7 mm | 7 | |
| 5 Sept. | Light rain shower | 29° /28° | 11.5 mm | 6 | |
| 6 Sept. | Patchy rain possible | 29° /28° | 3.2 mm | 6 | |
| 7 Sept. | Light rain shower | 29° /28° | 10.6 mm | 6 | |
| 8 Sept. | Light rain shower | 29° /28° | 14.1 mm | 6 | |
| 9 Sept. |  Moderate or heavy rain with thunder | 29° /27° | 11.8 mm | 6 | |
| 10 Sept. | Light rain shower | 30° /28° | 4 mm | 7 | |
| 11 Sept. |  Patchy light drizzle | 29° /27° | 17.6 mm | 6 | |
| 12 Sept. | Light rain shower | 29° /28° | 0.6 mm | 7 | |
| 13 Sept. | Patchy rain possible | 30° /28° | 1.8 mm | 7 | |
| 14 Sept. | Light rain shower | 29° /28° | 2.8 mm | 6 | |
| 15 Sept. | Patchy rain possible | 29° /28° | 2.1 mm | 6 | |
| 16 Sept. |  Partly cloudy | 29° /28° | 0 mm | 7 | |
| 17 Sept. |  Heavy rain | 29° /27° | 20.8 mm | 2.4 | |
| 18 Sept. |  Moderate rain | 29° /28° | 16.3 mm | 2.2 | |
| 19 Sept. | Moderate rain | 31° /28° | 8.8 mm | 2.6 | |
| 20 Sept. | Patchy rain possible | 29° /28° | 1 mm | 0.2 | |
| 21 Sept. | Partly cloudy | 28° /28° | 0 mm | 7 | |
| 22 Sept. |  Sunny | 28° /28° | 0 mm | 7 | |
| 23 Sept. | Sunny | 28° /28° | 0 mm | 7 | |
| 24 Sept. | Patchy rain possible | 29° /28° | 1.9 mm | 6 | |
| 25 Sept. | Patchy rain possible | 29° /29° | 1.2 mm | 6 | |
| 26 Sept. | Patchy rain possible | 29° /29° | 1.6 mm | 6 | |
| 27 Sept. | Partly cloudy | 29° /28° | 0 mm | 7 | |
| 28 Sept. | Patchy rain possible | 29° /28° | 0.6 mm | 6 | |
| 29 Sept. | Patchy rain possible | 29° /28° | 0.1 mm | 6 | |
| 30 Sept. | Light rain shower | 31° /28° | 7.9 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Saint Thomas Island 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 Saint Thomas Island forecast closer to your planned date for the most up-to-date weather information.
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Saint Thomas Island in September - FAQ
What are the expected maximum and minimum temperatures in Saint Thomas Island during September?
During September, expect a variety of temperatures with highs around 29° and lows near 28°, suitable for diverse activities and preferences.
How much rainfall should be expected in Saint Thomas Island during September?
Significant rainfall exceeding 203.8 mm is expected in Saint Thomas Island during September, occurring over more than 20 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Saint Thomas Island during September?
The average wind speed in Saint Thomas Island during September is 25 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Saint Thomas Island
Explore the daily rainfall trends and prepare for Saint Thomas Islands September weather 💧
UV exposure in Saint Thomas Island during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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