- Kids stay & eat for free at Marriot Bonvoy
- Destinations include Europe, Middle East & Africa
- Valid for up to 2 adults & 2 kids aged up to 12
St Louis weather in September 2025
Expect daytime maximum temperatures of 27°C in St Louis in September based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 78 mm of rainfall in the month.
- 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
More about St Louis
- Overview
- Best time to visit
- Weather by month
- 5-day weather forecast
- Destinations
- Travel advice
- Deals & discounts
St Louis by month
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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 |
Be inspired
Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers
We promise not to share your details
Related posts
Popular travel offers
Explore holidays in the sun for less
- Beach holidays
- Family holidays
- City breaks
- Summer holidays
- Winter sun holidays
- Holiday offers
- Top travel brands
- Airlines & flights
- Discount hotels
- Airport parking deals
- TUI
- Jet2holidays
- easyJet holidays
- Love Holidays
- January sales
Airport parking
- Manchester Airport
- Stansted Airport
- Bristol Airport
- Luton Airport
- Birmingham Airport
- Edinburgh Airport
- Gatwick Airport
- Glasgow Airport
- Newcastle Airport
Airport lounges
- Manchester Airport
- Birmingham Airport
- Bristol Airport
- Edinburgh Airport
- Glasgow Airport
- Heathrow Airport
- Newcastle Airport
- Stansted Airport
- Gatwick Airport