City of Saint Louis (St. Louis)
September
Weather in City of Saint Louis for September 2025
Your guide to City of Saint Louis weather in September - trends and predictions
In general, the average temperature in City of Saint Louis at the beginning of September is 30 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 27.3 °F by the end of September.
The climate of City of Saint Louis in September is notably wet, with an average of 15 rainy days, and a total of 82.9 mm of precipitation.
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Temperatures
Rain 🌧️
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15
Dry days
15
Rainy days
0
Snow days
29°/16°
Temperatures
16 km/h
Avg max wind
59 %
Avg humidity
City of Saint Louis in September average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  31° | 2 30° | 3  30° | 4  30° | 5  29° | 6  31° | |
| 7 29° | 8 28° | 9 29° | 10 30° | 11 31° | 12 29° | 13 29° |
| 14 29° | 15 29° | 16 31° | 17  29° | 18 31° | 19 32° | 20 32° |
| 21 28° | 22 27° | 23 23° | 24 28° | 25 27° | 26 28° | 27 27° |
| 28 27° | 29  27° | 30 27° |
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Temperatures trend during September in City of Saint Louis
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 |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 31° /16° | 0.9 mm | 7 | |
| Sept. 2 | Sunny | 30° /16° | 0.1 mm | 7 | |
| Sept. 3 | Partly cloudy | 30° /17° | 3.6 mm | 7 | |
| Sept. 4 | Moderate or heavy rain shower | 30° /18° | 8.7 mm | 7 | |
| Sept. 5 | Overcast | 29° /19° | 1.2 mm | 7 | |
| Sept. 6 | Patchy rain possible | 31° /19° | 0.7 mm | 7 | |
| Sept. 7 | Sunny | 29° /16° | 0.2 mm | 7 | |
| Sept. 8 | Sunny | 28° /14° | 0.1 mm | 7 | |
| Sept. 9 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 10 | Sunny | 30° /15° | 0.3 mm | 7 | |
| Sept. 11 | Sunny | 31° /17° | 4 mm | 7 | |
| Sept. 12 | Sunny | 29° /17° | 6.1 mm | 7 | |
| Sept. 13 | Sunny | 29° /15° | 1.4 mm | 7 | |
| Sept. 14 | Sunny | 29° /15° | 1.6 mm | 7 | |
| Sept. 15 | Overcast | 29° /16° | 0.7 mm | 7 | |
| Sept. 16 | Partly cloudy | 31° /17° | 0.1 mm | 8 | |
| Sept. 17 | Heavy rain at times | 29° /17° | 0.4 mm | 7 | |
| Sept. 18 | Sunny | 31° /17° | 0 mm | 7 | |
| Sept. 19 | Sunny | 32° /18° | 0.1 mm | 8 | |
| Sept. 20 | Patchy rain possible | 32° /19° | 1.9 mm | 7 | |
| Sept. 21 | Moderate or heavy rain shower | 28° /18° | 16.6 mm | 6 | |
| Sept. 22 | Sunny | 27° /16° | 19.3 mm | 7 | |
| Sept. 23 | Sunny | 23° /14° | 7.8 mm | 5 | |
| Sept. 24 | Sunny | 28° /15° | 4.2 mm | 6 | |
| Sept. 25 | Sunny | 27° /15° | 0.5 mm | 6 | |
| Sept. 26 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 27 | Sunny | 27° /16° | 0.9 mm | 6 | |
| Sept. 28 | Sunny | 27° /15° | 1.3 mm | 7 | |
| Sept. 29 | Cloudy | 27° /15° | 0 mm | 7 | |
| Sept. 30 | Sunny | 27° /16° | 0.2 mm | 6 | |
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Important Notice
Our weather forecast for City of Saint Louis 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 City of Saint Louis forecast closer to your planned date for the most up-to-date weather information.
City of Saint Louis in September - FAQ
What are the expected maximum and minimum temperatures in City of Saint Louis during September?
During September, expect a variety of temperatures with highs around 29° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in City of Saint Louis during September?
Moderate rainfall is anticipated in City of Saint Louis during September, with a total of 82.9 mm spread over approximately 15 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in City of Saint Louis during September?
The average wind speed in City of Saint Louis during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in City of Saint Louis
Explore the daily rainfall trends and prepare for City of Saint Louiss September weather 💧
UV exposure in City of Saint Louis during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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