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Weather in St. Thomas for September 2026

Your guide to St. Thomas weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in St. Thomas is slightly cooler than the historical average by 1.4 °C.

  • The forecast for the next days in St. Thomas predicts a temperature of 17.1 °C, which is cooler than the historical average.

  • In general, the average temperature in St. Thomas at the beginning of September is 25.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22 °C by the end of September.

    • Rain 🌧️

  • St. Thomas experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 78.6 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/12°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
73 %
Avg humidity

St. Thomas Weather September

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

Temperatures trend during September in St. Thomas

See the weather trend as well as the moving average line

September weather in St. Thomas day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 26° /13° 0.2 mm 6
2 Sept. Fog
Fog
 25° /13° 17.2 mm 5
3 Sept. Mist
Mist
 28° /13° 23.1 mm 5
4 Sept. Partly cloudy
Partly cloudy
 27° /14° 6.5 mm 6
5 Sept. Sunny
Sunny
 27° /13° 0 mm 7
6 Sept. Fog
Fog
 24° /13° 4.5 mm 6
7 Sept. Light rain shower
Light rain shower
 20° /10° 2.3 mm 5
8 Sept. Overcast
Overcast
 22° /10° 0 mm 4
9 Sept. Overcast
Overcast
 25° /12° 2.7 mm 4
10 Sept. Overcast
Overcast
 24° /12° 0.1 mm 6
11 Sept. Overcast
Overcast
 26° /11° 0.1 mm 6
12 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /11° 3.9 mm 6
13 Sept. Overcast
Overcast
 24° /13° 0.1 mm 5
14 Sept. Mist
Mist
 25° /10° 0 mm 6
15 Sept. Partly cloudy
Partly cloudy
 26° /11° 0.9 mm 5
16 Sept. Mist
Mist
 26° /12° 0.6 mm 5
17 Sept. Patchy light drizzle
Patchy light drizzle
 24° /13° 0.6 mm 4
18 Sept. Fog
Fog
 24° /10° 0 mm 5
19 Sept. Fog
Fog
 21° /11° 0.6 mm 4
20 Sept. Overcast
Overcast
 23° /10° 0 mm 4
21 Sept. Fog
Fog
 22° /12° 3.5 mm 4
22 Sept. Partly cloudy
Partly cloudy
 23° /13° 13.6 mm 6
23 Sept. Mist
Mist
 21° /13° 18.8 mm 5
24 Sept. Overcast
Overcast
 21° /12° 2.1 mm 5
25 Sept. Partly cloudy
Partly cloudy
 23° /12° 2.7 mm 5
26 Sept. Fog
Fog
 23° /12° 0 mm 5
27 Sept. Sunny
Sunny
 24° /11° 0 mm 5
28 Sept. Overcast
Overcast
 21° /11° 0 mm 4.1
29 Sept. Overcast
Overcast
 23° /15° 0 mm 4.6
30 Sept. Overcast
Overcast
 19° /15° 0.3 mm 1
Next
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.
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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 24° 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?
Moderate rainfall is anticipated in St. Thomas during September, with a total of 78.6 mm spread over approximately 10 days. Considering plans for rainy days is advisable.

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 💧
Typically, St. Thomas has 10 rainy days in September with a total of 78.6 mm of rainfall.

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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Location coordinates Where is St. Thomas?

Get accurate weather forecasts for St. Thomas, located at latitude 42.774 and longitude -81.18. Stay updated with localized weather information tailored for St. Thomas.

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