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Boise weather in September 2025
Expect 25°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Boise in September. Check more long-term weather averages for Boise in September before you book your next holiday to Idaho in 2025/2026.
- 2525°C max day temperature
- 10 hours of sunshine per day
- 44 days with some rainfall
- 88°C min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 1919 mm of monthly rainfall
- 66 (High) UV index
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The September weather guide for Idaho (Boise) 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 Boise in September?
Daytime temperatures usually reach 25°C in Boise in September with no heat and humidity, falling to 8°C at night.
How sunny is it in Boise in September?
There are normally 10 hours of bright sunshine each day in Boise in September - that's 80% of daylight hours.
Does it rain in Boise in September?
There are usually 4 days with some rain in Boise in September and the average monthly rainfall is 19mm.
Boise September sunrise & sunset times
Browse the sunrise and sunset times for Boise in September 2025. Select a month to view Boise sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 06:09 | 19:19 |
Monday, 15th September 2025 | 06:25 | 18:54 |
Tuesday, 30th September 2025 | 06:42 | 18:27 |
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