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Flagstaff weather in September 2025
Expect 73°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Flagstaff in September. Check more long-term weather averages for Flagstaff in September before you book your next holiday to Arizona in 2025/2026.
- 7373°F max day temperature
- 10 hours of sunshine per day
- 77 days with some rainfall
- 3737°F min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 1.91.9 inches of monthly rainfall
- 99 (Very High) UV index
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Recommended for Arizona
The September weather guide for Arizona (Flagstaff) 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 Arizona
How hot is it in Flagstaff in September?
Daytime temperatures usually reach 73°F in Flagstaff in September, falling to 37°F at night.
How sunny is it in Flagstaff in September?
There are normally 10 hours of bright sunshine each day in Flagstaff in September - that's 79% of daylight hours.
Does it rain in Flagstaff in September?
There are usually 7 days with some rain in Flagstaff in September and the average monthly rainfall is 1.9 inches.
Flagstaff September sunrise & sunset times
Browse the sunrise and sunset times for Flagstaff in September 2025. Select a month to view Flagstaff sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:59 | 18:53 |
Monday, 15th September 2025 | 06:10 | 18:33 |
Tuesday, 30th September 2025 | 06:21 | 18:11 |
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