St. Louis (Missouri) in september: average Weather, Temperature and Climate
Weather in St. Louis (Missouri) in september 2025
The weather in St. Louis (Missouri) in september comes from statistical datas on the last years. You can view the weather statistics the entire month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather UV index: 6
Weather at 6am
63°F
Clear/Sunny
36% of time
22%
17%
16%
Weather at 12pm
79°F
Clear/Sunny
50% of time
21%
14%
10%
Weather at 6pm
74°F
Clear/Sunny
56% of time
22%
13%
7%
Weather at 3am
65°F
45%
19%
16%
11%
Evolution of daily average temperature and precipitation in St. Louis (Missouri) in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in St. Louis (Missouri) in september.
The climate of St. Louis (Missouri) in september is good
In september in St. Louis (Missouri), the climate is wet (with 5.2in of precipitation over 7 days). This is better than the previous month since in august it receives an average of 7in of precipitation over 9 days.
The climate quite enjoyable in that area this month. The thermometer averaged maximum of 81°F. On average, the recorded minimum temperature is 63°F. Thus, the mean temperature average on this month of september in St. Louis (Missouri) is 72°F. Note that seasonal normals in contrast with those observed in St. Louis (Missouri) in september with a maximum record of 101°F in 2021 and a minimum record of 41°F in 2011. You can expect to have about 9 days with temperatures over 86°F, or 30 of time.
Day length in St. Louis (Missouri) in september is 12:25. The sun rises at 05:43 and sets at 18:08.
With good weather conditions, the month of september is advisable to go in that area in United States.
Seasonal average climate and temperature of St. Louis (Missouri) in september
Check below seasonal norms These datas are set from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 72°F | ||||
| Highest temperature | 81°F | ||||
| Lowest temperature | 63°F | ||||
| Highest record temperature | 101°F (2021) | ||||
| Lowest record temperature | 41°F (2011) | ||||
| Number of days at +86°F | 9 day(s) (30%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Number of days at -32°F | 0 day(s) (0%) | ||||
| Wind | |||||
| Wind speed | 14km/h | ||||
| Wind temperature | 63°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 5.2in | ||||
| Number of days with rainfall | 7 day(s) (22%) | ||||
| Record daily rainfall | 2.6in (2011) | ||||
| Snowfall | 0cm | ||||
| Other climate data | |||||
| Humidity | 87% | ||||
| Visibility | 9.18km | ||||
| Cloud cover | 27% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:43 | ||||
| Time of sunset | 18:08 | ||||
| Length of day | 12:25 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in St. Louis (Missouri) in september 2024:
68°F to 90°F
59°F to 83°F
59°F to 79°F
61°F to 86°F
67°F to 90°F
67°F to 85°F
52°F to 74°F
49°F to 76°F
56°F to 86°F
59°F to 92°F
65°F to 95°F
67°F to 85°F
65°F to 77°F
65°F to 83°F
67°F to 83°F
70°F to 90°F
67°F to 83°F
63°F to 88°F
67°F to 92°F
67°F to 88°F
72°F to 81°F
70°F to 88°F
63°F to 68°F
67°F to 70°F
58°F to 76°F
56°F to 81°F
65°F to 72°F
63°F to 76°F
67°F to 72°F
65°F to 76°F
Map: other cities in the United States (USA) in september
Cities near St. Louis (Missouri):
| Missouri in september | good weather |
| Illinois in september | good weather |
| Indianapolis in september | good weather |
| Memphis in september | perfect weather |
| Kansas City in september | good weather |
| Louisville (Kentucky) in september | good weather |
| Arkansas in september | perfect weather |
| Nashville in september | good weather |
| Chicago in september | good weather |
| Des Moines in september | good weather |
| Cincinnati in september | good weather |
| Wisconsin in september | good weather |
Click over cities on the map for information about the weather in september.
St. Louis (Missouri)
perfect weather
good
tolerable
bad
very bad
Weather data for St. Louis (Missouri) in september:
Weather data for St. Louis (Missouri) for september are derived from an average of the weather forecast since 2009 in St. Louis (Missouri). There is a margin of error and these forecasts are to be considered as general information only. The weather in St. Louis (Missouri) can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to St. Louis (Missouri).