- Save 40% on annual memberships with exclusive offer
- Sign up to Secret Flight Club for FREE 7-day trial
- Members usually save up to 81% with flight deals
Boise weather in September 2025
Expect 77°F 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.
- 7777°F max day temperature
- 10 hours of sunshine per day
- 44 days with some rainfall
- 4646°F min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 0.70.7 inches of monthly rainfall
- 66 (High) UV index
More about Boise
- Overview
- Best time to visit
- Weather by month
- 5-day weather forecast
- Destinations
- Travel advice
- Deals & discounts
Boise by month
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Recommended for Idaho
Expires at 23:59 on Tuesday 31st Dec 2024 · View all Secret Flight Club offers
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) | Imperial (°F)
More about the USA
How hot is it in Boise in September?
Daytime temperatures usually reach 77°F in Boise in September with no heat and humidity, falling to 46°F 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 0.7 inches.
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 |
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
- Black Friday 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