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Great Falls weather in September 2025
Expect 21°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Great Falls in September. Check more long-term weather averages for Great Falls in September before you book your next holiday to Montana in 2025/2026.
- 2121°C max day temperature
- 8 hours of sunshine per day
- 77 days with some rainfall
- 66°C min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 2626 mm of monthly rainfall
- 55 (Moderate) UV index
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Recommended for Montana
The September weather guide for Montana (Great Falls) 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 Great Falls in September?
Daytime temperatures usually reach 21°C in Great Falls in September, falling to 6°C at night.
How sunny is it in Great Falls in September?
There are normally 8 hours of bright sunshine each day in Great Falls in September - that's 66% of daylight hours.
Does it rain in Great Falls in September?
There are usually 7 days with some rain in Great Falls in September and the average monthly rainfall is 26mm.
Great Falls September sunrise & sunset times
Browse the sunrise and sunset times for Great Falls in September 2025. Select a month to view Great Falls sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:44 | 19:05 |
Monday, 15th September 2025 | 06:03 | 18:36 |
Tuesday, 30th September 2025 | 06:23 | 18:06 |
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