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Boise weather in September 2025
Expect daytime maximum temperatures of 25°C in Boise, Idaho in September based on long-term weather averages. There are 10 hours of sunshine per day on average.
- 25°C max day temperature
25 - 10 hours of sunshine per day
- 4 days with some rainfall
4 - 8°C min night temperature
8 - 12 hours of daylight per day
12 - No heat & humidity
0 - 19 mm of monthly rainfall
19 - 6 (High) UV index
6
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Recommended for Idaho
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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