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 31.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.1 °F by the end of September.
City of Saint Louis sees moderate rainfall in September, averaging 8 rainy days.
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22
Dry days
8
Rainy days
0
Snow days
31°/16°
Temperatures
15 km/h
Avg max wind
57 %
Avg humidity
City of Saint Louis in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  32° | 2  31° | 3 32° | 4  32° | 5  33° | 6 31° | 7  27° |
| 8  27° | 9 30° | 10 33° | 11 33° | 12  27° | 13 27° | 14 29° |
| 15 30° | 16 30° | 17 28° | 18 30° | 19 32° | 20 30° | 21  29° |
| 22 31° | 23 25° | 24 24° | 25 27° | 26 29° | 27  26° | 28 27° |
| 29 28° | 30 29° |
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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 | 32° /15° | 0 mm | 8 | |
| Sept. 2 | Mist | 31° /14° | 0 mm | 8 | |
| Sept. 3 | Mist | 32° /17° | 0 mm | 7 | |
| Sept. 4 | Patchy rain possible | 32° /18° | 0.2 mm | 8 | |
| Sept. 5 | Thundery outbreaks possible | 33° /20° | 0 mm | 8 | |
| Sept. 6 | Patchy rain possible | 31° /19° | 1.1 mm | 7 | |
| Sept. 7 | Partly cloudy | 27° /13° | 0 mm | 7 | |
| Sept. 8 | Overcast | 27° /11° | 0 mm | 7 | |
| Sept. 9 | Mist | 30° /12° | 0 mm | 7 | |
| Sept. 10 | Sunny | 33° /14° | 0 mm | 8 | |
| Sept. 11 | Overcast | 33° /18° | 0 mm | 8 | |
| Sept. 12 | Heavy rain | 27° /17° | 12.2 mm | 7 | |
| Sept. 13 | Sunny | 27° /14° | 2.8 mm | 7 | |
| Sept. 14 | Sunny | 29° /14° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 30° /15° | 0.1 mm | 7 | |
| Sept. 16 | Overcast | 30° /17° | 0.2 mm | 7 | |
| Sept. 17 | Overcast | 28° /16° | 0 mm | 6 | |
| Sept. 18 | Mist | 30° /14° | 0 mm | 7 | |
| Sept. 19 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 20 | Overcast | 30° /17° | 3.2 mm | 7 | |
| Sept. 21 | Moderate or heavy rain shower | 29° /18° | 30.9 mm | 7 | |
| Sept. 22 | Patchy rain possible | 31° /18° | 38.6 mm | 7 | |
| Sept. 23 | Overcast | 25° /17° | 15.1 mm | 6 | |
| Sept. 24 | Patchy rain possible | 24° /17° | 8.3 mm | 6 | |
| Sept. 25 | Mist | 27° /14° | 0.6 mm | 6 | |
| Sept. 26 | Thundery outbreaks possible | 29° /15° | 0 mm | 7 | |
| Sept. 27 | Patchy light rain with thunder | 26° /17° | 1.8 mm | 6 | |
| Sept. 28 | Fog | 27° /17° | 2.6 mm | 6 | |
| Sept. 29 | Partly cloudy | 28° /17° | 0 mm | 7 | |
| Sept. 30 | Sunny | 29° /17° | 0 mm | 7 | |
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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?
Expect warm days with temperatures around 31°, cooling to mild conditions of 16° after sunset. Perfect for those who enjoy warm weather.
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 76.2 mm spread over approximately 8 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 15 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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