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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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Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/16°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
57 %
Avg humidity

City of Saint Louis in September average weather

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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
Sunny
32° /15° 0 mm 8
Sept. 2 Mist
Mist
31° /14° 0 mm 8
Sept. 3 Mist
Mist
32° /17° 0 mm 7
Sept. 4 Patchy rain possible
Patchy rain possible
32° /18° 0.2 mm 8
Sept. 5 Thundery outbreaks possible
Thundery outbreaks possible
33° /20° 0 mm 8
Sept. 6 Patchy rain possible
Patchy rain possible
31° /19° 1.1 mm 7
Sept. 7 Partly cloudy
Partly cloudy
27° /13° 0 mm 7
Sept. 8 Overcast
Overcast
27° /11° 0 mm 7
Sept. 9 Mist
Mist
30° /12° 0 mm 7
Sept. 10 Sunny
Sunny
33° /14° 0 mm 8
Sept. 11 Overcast
Overcast
33° /18° 0 mm 8
Sept. 12 Heavy rain
Heavy rain
27° /17° 12.2 mm 7
Sept. 13 Sunny
Sunny
27° /14° 2.8 mm 7
Sept. 14 Sunny
Sunny
29° /14° 0 mm 7
Sept. 15 Partly cloudy
Partly cloudy
30° /15° 0.1 mm 7
Sept. 16 Overcast
Overcast
30° /17° 0.2 mm 7
Sept. 17 Overcast
Overcast
28° /16° 0 mm 6
Sept. 18 Mist
Mist
30° /14° 0 mm 7
Sept. 19 Sunny
Sunny
32° /15° 0 mm 8
Sept. 20 Overcast
Overcast
30° /17° 3.2 mm 7
Sept. 21 Moderate or heavy rain shower
Moderate or heavy rain shower
29° /18° 30.9 mm 7
Sept. 22 Patchy rain possible
Patchy rain possible
31° /18° 38.6 mm 7
Sept. 23 Overcast
Overcast
25° /17° 15.1 mm 6
Sept. 24 Patchy rain possible
Patchy rain possible
24° /17° 8.3 mm 6
Sept. 25 Mist
Mist
27° /14° 0.6 mm 6
Sept. 26 Thundery outbreaks possible
Thundery outbreaks possible
29° /15° 0 mm 7
Sept. 27 Patchy light rain with thunder
Patchy light rain with thunder
26° /17° 1.8 mm 6
Sept. 28 Fog
Fog
27° /17° 2.6 mm 6
Sept. 29 Partly cloudy
Partly cloudy
28° /17° 0 mm 7
Sept. 30 Sunny
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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Location coordinates Where is City of Saint Louis?

Get accurate weather forecasts for City of Saint Louis, located at latitude 38.627 and longitude -90.198. Stay updated with localized weather information tailored for City of Saint Louis.

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