Flagstaff in September
7.9out of 10
Yes, a good time to go
Warm and comfortable: highs around 23°C. Frequent rain: about 9 rainy days.
23°CAvg high
10°CAvg low
9Rainy days (58 mm)
12:13 hDaylight
06:15Sunrise · 18:27 Sunset
Why this score
- Warm and comfortable: highs around 23°C
- Frequent rain: about 9 rainy days
- Rain varies a lot between years (±4.4 days)
What to wear and pack
- T-shirts and light layers
- A light jacket for cooler evenings
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±4.4 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 5°C | -6°C | 46 mm | 6 | – | – | 5.1 |
| February | 7°C | -4°C | 50 mm | 7 | – | – | 5.3 |
| March | 11°C | -2°C | 49 mm | 8 | – | – | 6.0 |
| April | 15°C | 1°C | 31 mm | 6 | – | – | 7.0 |
| May | 20°C | 6°C | 32 mm | 6 | – | – | 8.0 |
| June | 26°C | 11°C | 11 mm | 3 | – | – | 8.7 |
| July | 27°C | 14°C | 115 mm | 15 | – | – | 6.9 |
| August | 25°C | 13°C | 126 mm | 17 | – | – | 6.7 |
| September | 23°C | 10°C | 58 mm | 9 | – | – | 7.9 |
| October | 17°C | 5°C | 33 mm | 5 | – | – | 7.6 |
| November | 11°C | -1°C | 31 mm | 4 | – | – | 6.5 |
| December | 5°C | -5°C | 42 mm | 6 | – | – | 5.1 |
Frequently asked questions
How hot is Flagstaff in September?
Daytime highs average 23°C and nights about 10°C.
When is the best time to visit Flagstaff?
The best months are June.