Weather in Flagstaff in September
Flagstaff, United States averages a high of 23.4°C (74.1°F) and low of 12.2°C (54°F) in September, with 8 rain days and 11.7 hours of daily sunshine. Travel score: 87.4/100 (Excellent). The best time to visit Flagstaff is June.
High
23°C74°F
Low
12°C54°F
🌧️
8
rain days
☀️
11.7
hrs/day sunshine
💧
50%
humidity
87— Excellent
September in Flagstaff is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Flagstaff?
How much does it rain in Flagstaff in September?
Flagstaff receives an average of 51.5mm of rainfall across 8 rainy days in September. The annual total is 552.2mm.
What should I pack for Flagstaff in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 23°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31