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United States weather

Weather in City of Saint Louis, Missouri for September 2026

Your guide to City of Saint Louis weather in September - trends and predictions

    Temperatures

  • So far, September 2026 in City of Saint Louis 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 City of Saint Louis with the forecasted temperature being 22.2 °F, much lower than usual.

  • In general, the average temperature in City of Saint Louis 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.

    • Rain 🌧️

  • The climate of City of Saint Louis in September is notably wet, with an average of 15 rainy days, and a total of 156.3 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
15
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/17°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
60 %
Avg humidity

City of Saint Louis Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
32°
2
Sunny
32°
3
Overcast
31°
4
Moderate or heavy rain shower
31°
5
Overcast
30°
6
Patchy rain possible
30°
7
Sunny
30°
8
Sunny
29°
9
Sunny
29°
10
Sunny
30°
11
Partly cloudy
31°
12
Sunny
30°
13
Sunny
31°
14
Sunny
31°
15
Overcast
32°
16
Partly cloudy
32°
17
Overcast
31°
18
Sunny
32°
19
Sunny
33°
20
Overcast
32°
21
Moderate or heavy rain shower
27°
22
Moderate or heavy rain shower
27°
23
Patchy rain possible
24°
24
Overcast
26°
25
Fog
26°
26
Sunny
27°
27
Sunny
27°
28
Sunny
28°
29
Sunny
30°
30
Overcast
33°

Temperatures trend during September in City of Saint Louis

See the weather trend as well as the moving average line

September weather in City of Saint Louis day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 32° /17° 0.6 mm 7
Sept. 2 Sunny
Sunny
 32° /17° 0.1 mm 7
Sept. 3 Overcast
Overcast
 31° /19° 2.4 mm 7
Sept. 4 Moderate or heavy rain shower
Moderate or heavy rain shower
 31° /19° 9.8 mm 7
Sept. 5 Overcast
Overcast
 30° /19° 0.8 mm 7
Sept. 6 Patchy rain possible
Patchy rain possible
 30° /18° 6.4 mm 7
Sept. 7 Sunny
Sunny
 30° /15° 0.2 mm 7
Sept. 8 Sunny
Sunny
 29° /13° 0.1 mm 7
Sept. 9 Sunny
Sunny
 29° /14° 0.4 mm 7
Sept. 10 Sunny
Sunny
 30° /15° 8.4 mm 6
Sept. 11 Partly cloudy
Partly cloudy
 31° /18° 3.1 mm 6
Sept. 12 Sunny
Sunny
 30° /17° 4.1 mm 8
Sept. 13 Sunny
Sunny
 31° /16° 1.1 mm 7
Sept. 14 Sunny
Sunny
 31° /17° 1.1 mm 7
Sept. 15 Overcast
Overcast
 32° /18° 1.2 mm 7
Sept. 16 Partly cloudy
Partly cloudy
 32° /18° 0.5 mm 7
Sept. 17 Overcast
Overcast
 31° /19° 0.5 mm 7
Sept. 18 Sunny
Sunny
 32° /18° 0 mm 7
Sept. 19 Sunny
Sunny
 33° /19° 2.1 mm 7
Sept. 20 Overcast
Overcast
 32° /20° 2.3 mm 6
Sept. 21 Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /19° 24.7 mm 5
Sept. 22 Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /16° 15 mm 6
Sept. 23 Patchy rain possible
Patchy rain possible
 24° /14° 6.8 mm 6
Sept. 24 Overcast
Overcast
 26° /15° 49.7 mm 6
Sept. 25 Fog
Fog
 26° /15° 0.4 mm 6
Sept. 26 Sunny
Sunny
 27° /14° 0.9 mm 6
Sept. 27 Sunny
Sunny
 27° /16° 0.9 mm 6
Sept. 28 Sunny
Sunny
 28° /15° 0.9 mm 7
Sept. 29 Sunny
Sunny
 30° /17° 0 mm 6.2
Sept. 30 Overcast
Overcast
 33° /22° 0 mm 5.8
Next
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.
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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 17°, suitable for diverse activities and preferences.

How much rainfall should be expected in City of Saint Louis during September?
Significant rainfall exceeding 156.3 mm is expected in City of Saint Louis during September, occurring over more than 15 days. Preparing for wet conditions is recommended in your planning.

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 💧
Typically, City of Saint Louis has 15 rainy days in September with a total of 156.3 mm of rainfall.

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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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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