Saint Louis County (Eureka)
September
Weather in Saint Louis County, Missouri for September 2027
Your guide to Saint Louis County weather in September - trends and predictions
In general, the average temperature in Saint Louis County at the beginning of September is 30.5 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.3 °C by the end of September.
Saint Louis County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 248.1 mm.
Is September a good time to visit Saint Louis County? check out the best time to travel to Saint Louis County page.
✨ Is September a good time to visit Saint Louis County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
29°/18°
Temperatures
12 km/h
Avg max wind
64 %
Avg humidity
Saint Louis County Weather September
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Temperatures trend during September in Saint Louis County
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September weather in Saint Louis County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Fog | 33° /20° | 0 mm | 7 | |
| Sept. 2 |  Sunny | 32° /19° | 0 mm | 8 | |
| Sept. 3 |  Overcast | 30° /18° | 0 mm | 7 | |
| Sept. 4 |  Light rain | 31° /18° | 4.8 mm | 7 | |
| Sept. 5 |  Partly cloudy | 31° /18° | 0 mm | 7 | |
| Sept. 6 | Light rain | 29° /18° | 9.4 mm | 6 | |
| Sept. 7 | Sunny | 27° /13° | 0 mm | 7 | |
| Sept. 8 | Sunny | 29° /11° | 0 mm | 7 | |
| Sept. 9 |  Patchy rain possible | 29° /15° | 1.5 mm | 7 | |
| Sept. 10 |  Moderate rain | 28° /16° | 21.1 mm | 5 | |
| Sept. 11 | Partly cloudy | 31° /19° | 0.7 mm | 6 | |
| Sept. 12 | Sunny | 31° /19° | 0 mm | 7.7 | |
| Sept. 13 | Patchy rain possible | 30° /20° | 1.5 mm | 6 | |
| Sept. 14 | Mist | 31° /19° | 0 mm | 7 | |
| Sept. 15 | Light rain shower | 31° /21° | 1.2 mm | 7 | |
| Sept. 16 | Patchy rain possible | 32° /21° | 1.7 mm | 6 | |
| Sept. 17 | Patchy rain possible | 32° /20° | 1 mm | 7 | |
| Sept. 18 | Sunny | 33° /19° | 0 mm | 7 | |
| Sept. 19 | Patchy rain possible | 33° /21° | 1.3 mm | 7 | |
| Sept. 20 | Moderate rain | 32° /21° | 11 mm | 5 | |
| Sept. 21 |  Thundery outbreaks possible | 25° /20° | 32.7 mm | 4 | |
| Sept. 22 | Moderate rain | 27° /18° | 11.8 mm | 5 | |
| Sept. 23 |  Heavy rain | 22° /15° | 31.1 mm | 5 | |
| Sept. 24 | Heavy rain | 21° /17° | 113.8 mm | 5 | |
| Sept. 25 | Fog | 24° /14° | 0 mm | 4 | |
| Sept. 26 | Patchy rain possible | 25° /14° | 1.1 mm | 4 | |
| Sept. 27 | Patchy rain possible | 25° /16° | 1.5 mm | 5 | |
| Sept. 28 | Sunny | 26° /16° | 0.9 mm | 6 | |
| Sept. 29 | Overcast | 27° /16° | 0 mm | 6 | |
| Sept. 30 | Mist | 29° /18° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Saint Louis County 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 Louis County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Saint Louis County in September - FAQ
What are the expected maximum and minimum temperatures in Saint Louis County during September?
During September, expect a variety of temperatures with highs around 29° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Saint Louis County during September?
Significant rainfall exceeding 248.1 mm is expected in Saint Louis County during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Saint Louis County during September?
The average wind speed in Saint Louis County during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Saint Louis County
Explore the daily rainfall trends and prepare for Saint Louis Countys September weather 💧
Typically, Saint Louis County has 8 rainy days in September with a total of 248.1 mm of rainfall.
UV exposure in Saint Louis County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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