Saint Thomas Island (Charlotte Amalie)
September
Weather in Saint Thomas Island for September 2025
Your guide to Saint Thomas Island weather in September - trends and predictions
In general, the average temperature in Saint Thomas Island at the beginning of September is 29.6 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 30.6 °C by the end of September.
Saint Thomas Island experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 142.1 mm.
Is September a good time to visit Saint Thomas Island? check out the best time to travel to Saint Thomas Island page.
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Temperatures
Rain 🌧️
More
7
Dry days
23
Rainy days
0
Snow days
30°/28°
Temperatures
25 km/h
Avg max wind
77 %
Avg humidity
Saint Thomas Island in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2  30° | 3 30° | 4 29° | 5  29° | 6 30° | 7 30° |
| 8 30° | 9  30° | 10 30° | 11 30° | 12 30° | 13  30° | 14  30° |
| 15  29° | 16 29° | 17 29° | 18 30° | 19 30° | 20 31° | 21 30° |
| 22 30° | 23 31° | 24 30° | 25 31° | 26 31° | 27 30° | 28  31° |
| 29 30° | 30 31° |
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Temperatures trend during September in Saint Thomas Island
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. | Heavy rain at times | 29° /28° | 13.5 mm | 6 | |
| 2 Sept. | Patchy rain possible | 30° /28° | 5 mm | 7 | |
| 3 Sept. | Patchy rain possible | 30° /28° | 2.1 mm | 7 | |
| 4 Sept. | Patchy rain possible | 29° /28° | 0.9 mm | 6 | |
| 5 Sept. | Partly cloudy | 29° /28° | 1.3 mm | 7 | |
| 6 Sept. | Light rain shower | 30° /28° | 1.5 mm | 7 | |
| 7 Sept. | Light rain shower | 30° /27° | 5 mm | 7 | |
| 8 Sept. | Light rain shower | 30° /28° | 4.4 mm | 7 | |
| 9 Sept. | Thundery outbreaks possible | 30° /28° | 12 mm | 7 | |
| 10 Sept. | Thundery outbreaks possible | 30° /27° | 2.8 mm | 7 | |
| 11 Sept. | Light rain shower | 30° /28° | 2.5 mm | 7 | |
| 12 Sept. | Light rain shower | 30° /28° | 1.2 mm | 7 | |
| 13 Sept. | Moderate or heavy rain shower | 30° /27° | 6.6 mm | 7 | |
| 14 Sept. | Overcast | 30° /28° | 2.1 mm | 7 | |
| 15 Sept. | Cloudy | 29° /28° | 0.3 mm | 6 | |
| 16 Sept. | Overcast | 29° /28° | 0.1 mm | 7 | |
| 17 Sept. | Light rain shower | 29° /27° | 0.6 mm | 6 | |
| 18 Sept. | Cloudy | 30° /27° | 0.2 mm | 7 | |
| 19 Sept. | Cloudy | 30° /27° | 0 mm | 7 | |
| 20 Sept. | Patchy rain possible | 31° /28° | 0.3 mm | 8 | |
| 21 Sept. | Light rain shower | 30° /28° | 2.3 mm | 7 | |
| 22 Sept. | Light rain shower | 30° /28° | 1.3 mm | 7 | |
| 23 Sept. | Light rain shower | 31° /27° | 33.7 mm | 7 | |
| 24 Sept. | Light rain shower | 30° /28° | 1.7 mm | 7 | |
| 25 Sept. | Patchy rain possible | 31° /28° | 0.2 mm | 8 | |
| 26 Sept. | Light rain shower | 31° /28° | 20.5 mm | 7 | |
| 27 Sept. | Light rain shower | 30° /28° | 8.1 mm | 7 | |
| 28 Sept. | Patchy light rain | 31° /28° | 2.4 mm | 7 | |
| 29 Sept. | Light rain shower | 30° /27° | 4.2 mm | 7 | |
| 30 Sept. | Patchy rain possible | 31° /28° | 5.2 mm | 7 | |
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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.
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 30° 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 142.1 mm is expected in Saint Thomas Island during September, occurring over more than 23 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.
What to pack to Saint Thomas Island in September?
As you prepare for your trip to Saint Thomas Island in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Saint Thomas Island, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Sandals/Flip-flops: Comfortable for warm climates
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
- Insect Repellent: For destinations with mosquitos or other insects
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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Where is Saint Thomas Island?Get accurate weather forecasts for Saint Thomas Island, located at latitude 18.342 and longitude -64.931. Stay updated with localized weather information tailored for Saint Thomas Island.
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