Missouri (St. Louis)
September
Weather in Missouri for September 2026
Your guide to Missouri weather in September - trends and predictions
So far, September 2026 in Missouri shows a warmer trend than usual by 2.1 °F.
An exceptional deviation from the historical average is forecasted for next days of September 2026 in Missouri with the forecasted temperature being 22.2 °F, much lower than usual.
In general, the average temperature in Missouri at the beginning of September is 30.9 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 28.1 °F by the end of September.
The climate of Missouri in September is notably wet, with an average of 15 rainy days, and a total of 156.3 mm of precipitation.
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Temperatures
Rain 🌧️
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15
Dry days
15
Rainy days
0
Snow days
29°/17°
Temperatures
16 km/h
Avg max wind
60 %
Avg humidity
Missouri Weather September
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What’s the Weather Like in Missouri This September?
Discover the average temperatures and weather trends across Missouri’s cities this September.
Temperatures trend during September in Missouri
See the weather trend as well as the moving average line
September weather in Missouri day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 32° /17° | 0.6 mm | 7 | |
| Sept. 2 | Sunny | 32° /17° | 0.1 mm | 7 | |
| Sept. 3 |  Overcast | 31° /19° | 2.4 mm | 7 | |
| Sept. 4 |  Moderate or heavy rain shower | 31° /19° | 9.8 mm | 7 | |
| Sept. 5 | Overcast | 30° /19° | 0.8 mm | 7 | |
| Sept. 6 |  Patchy rain possible | 30° /18° | 6.4 mm | 7 | |
| Sept. 7 | Sunny | 30° /15° | 0.2 mm | 7 | |
| Sept. 8 | Sunny | 29° /13° | 0.1 mm | 7 | |
| Sept. 9 | Sunny | 29° /14° | 0.4 mm | 7 | |
| Sept. 10 | Sunny | 30° /15° | 8.4 mm | 6 | |
| Sept. 11 |  Partly cloudy | 31° /18° | 3.1 mm | 6 | |
| Sept. 12 | Sunny | 30° /17° | 4.1 mm | 8 | |
| Sept. 13 | Sunny | 31° /16° | 1.1 mm | 7 | |
| Sept. 14 | Sunny | 31° /17° | 1.1 mm | 7 | |
| Sept. 15 | Overcast | 32° /18° | 1.2 mm | 7 | |
| Sept. 16 | Partly cloudy | 32° /18° | 0.5 mm | 7 | |
| Sept. 17 | Overcast | 31° /19° | 0.5 mm | 7 | |
| Sept. 18 | Sunny | 32° /18° | 0 mm | 7 | |
| Sept. 19 | Sunny | 33° /19° | 2.1 mm | 7 | |
| Sept. 20 | Overcast | 32° /20° | 2.3 mm | 6 | |
| Sept. 21 | Moderate or heavy rain shower | 27° /19° | 24.7 mm | 5 | |
| Sept. 22 | Moderate or heavy rain shower | 27° /16° | 15 mm | 6 | |
| Sept. 23 | Patchy rain possible | 24° /14° | 6.8 mm | 6 | |
| Sept. 24 | Overcast | 26° /15° | 49.7 mm | 6 | |
| Sept. 25 |  Fog | 26° /15° | 0.4 mm | 6 | |
| Sept. 26 | Sunny | 27° /14° | 0.9 mm | 6 | |
| Sept. 27 | Sunny | 27° /16° | 0.9 mm | 6 | |
| Sept. 28 | Sunny | 28° /15° | 0.9 mm | 7 | |
| Sept. 29 | Sunny | 30° /17° | 0 mm | 6.2 | |
| Sept. 30 | Overcast | 33° /22° | 0 mm | 5.8 | |
| Next | |||||
Important Notice
Our weather forecast for Missouri 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 Missouri forecast closer to your planned date for the most up-to-date weather information.
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Missouri in September - FAQ
What are the expected maximum and minimum temperatures in Missouri during September?
During September, expect a variety of temperatures with highs around 29° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Missouri during September?
Significant rainfall exceeding 156.3 mm is expected in Missouri during September, occurring over more than 15 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Missouri during September?
The average wind speed in Missouri during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Missouri
Explore the daily rainfall trends and prepare for Missouris September weather 💧
Typically, Missouri has 15 rainy days in September with a total of 156.3 mm of rainfall.
UV exposure in Missouri during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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