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Weather in Saint Thomas for September 2025

Your guide to Saint Thomas weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Hydrologic Outlook - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Saint Thomas 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 predicts temperatures to be around 29 °C, close to the historical average.

  • In general, the average temperature in Saint Thomas 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.

    • Rain 🌧️

  • Saint Thomas in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 203.8 mm.

Average dry days
10
Dry days
Average rainy days
20
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/28°
Temperatures
Average wind speed
25 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Saint Thomas Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
29°
2
Light rain shower
30°
3
Light rain shower
30°
4
Light rain shower
30°
5
Light rain shower
29°
6
Patchy rain possible
29°
7
Light rain shower
29°
8
Light rain shower
29°
9
Moderate or heavy rain with thunder
29°
10
Light rain shower
30°
11
Patchy light drizzle
29°
12
Light rain shower
29°
13
Patchy rain possible
30°
14
Light rain shower
29°
15
Patchy rain possible
29°
16
Partly cloudy
29°
17
Weather Alert Heavy rain
29°
18
Moderate rain
29°
19
Moderate rain
31°
20
Patchy rain possible
29°
21
Partly cloudy
28°
22
Sunny
28°
23
Sunny
28°
24
Patchy rain possible
29°
25
Patchy rain possible
29°
26
Patchy rain possible
29°
27
Partly cloudy
29°
28
Patchy rain possible
29°
29
Patchy rain possible
29°
30
Light rain shower
31°

Temperatures trend during September in Saint Thomas

See the weather trend as well as the moving average line

September weather in Saint Thomas day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 29° /28° 0.5 mm 7
2 Sept. Light rain shower
Light rain shower
 30° /28° 4.1 mm 7
3 Sept. Light rain shower
Light rain shower
 30° /28° 1.6 mm 7
4 Sept. Light rain shower
Light rain shower
 30° /28° 0.7 mm 7
5 Sept. Light rain shower
Light rain shower
 29° /28° 11.5 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 3.2 mm 6
7 Sept. Light rain shower
Light rain shower
 29° /28° 10.6 mm 6
8 Sept. Light rain shower
Light rain shower
 29° /28° 14.1 mm 6
9 Sept. Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 29° /27° 11.8 mm 6
10 Sept. Light rain shower
Light rain shower
 30° /28° 4 mm 7
11 Sept. Patchy light drizzle
Patchy light drizzle
 29° /27° 17.6 mm 6
12 Sept. Light rain shower
Light rain shower
 29° /28° 0.6 mm 7
13 Sept. Patchy rain possible
Patchy rain possible
 30° /28° 1.8 mm 7
14 Sept. Light rain shower
Light rain shower
 29° /28° 2.8 mm 6
15 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 2.1 mm 6
16 Sept. Partly cloudy
Partly cloudy
 29° /28° 0 mm 7
17 Sept. Heavy rain
Heavy rain
 29° /27° 20.8 mm 2.4
18 Sept. Moderate rain
Moderate rain
 29° /28° 16.3 mm 2.2
19 Sept. Moderate rain
Moderate rain
 31° /28° 8.8 mm 2.6
20 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 1 mm 0.2
21 Sept. Partly cloudy
Partly cloudy
 28° /28° 0 mm 7
22 Sept. Sunny
Sunny
 28° /28° 0 mm 7
23 Sept. Sunny
Sunny
 28° /28° 0 mm 7
24 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 1.9 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
 29° /29° 1.2 mm 6
26 Sept. Patchy rain possible
Patchy rain possible
 29° /29° 1.6 mm 6
27 Sept. Partly cloudy
Partly cloudy
 29° /28° 0 mm 7
28 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 0.6 mm 6
29 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 0.1 mm 6
30 Sept. Light rain shower
Light rain shower
 31° /28° 7.9 mm 7
Next
Important Notice
Our weather forecast for Saint 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 Saint Thomas forecast closer to your planned date for the most up-to-date weather information.
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Saint Thomas in September - FAQ

What are the expected maximum and minimum temperatures in Saint Thomas 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 during September?
Significant rainfall exceeding 203.8 mm is expected in Saint Thomas 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 during September?
The average wind speed in Saint Thomas during September is 25 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Saint Thomas

Explore the daily rainfall trends and prepare for Saint Thomass September weather 💧

UV exposure in Saint Thomas during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Saint Thomas?

Get accurate weather forecasts for Saint Thomas, located at latitude 18.351 and longitude -64.924. Stay updated with localized weather information tailored for Saint Thomas.

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