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St Louis weather in September 2025
Expect 27°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in St Louis in September. Check more long-term weather averages for St Louis in September before you book your next holiday to Missouri in 2025/2026.
- 27°C max day temperature
27 - 8 hours of sunshine per day
- 8 days with some rainfall
8 - 15°C min night temperature
15 - 12 hours of daylight per day
12 - Low heat & humidity
L - 78 mm of monthly rainfall
78 - 7 (High) UV index
7
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Recommended for Missouri
The September weather guide for Missouri (St Louis) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C / mm) | Imperial (°F / inches)
More about the USA
How hot is it in St Louis in September?
Daytime temperatures usually reach 27°C in St Louis in September with low heat and humidity, falling to 15°C at night.
How sunny is it in St Louis in September?
There are normally 8 hours of bright sunshine each day in St Louis in September - that's 63% of daylight hours.
Does it rain in St Louis in September?
There are usually 8 days with some rain in St Louis in September and the average monthly rainfall is 78mm.
St Louis September sunrise & sunset times
Browse the sunrise and sunset times for St Louis in September 2025. Select a month to view St Louis sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 05:30 | 18:30 |
| Monday, 15th September 2025 | 05:43 | 18:08 |
| Tuesday, 30th September 2025 | 05:56 | 17:45 |
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