Places › Flagstaff, AZ › September

Flagstaff in September

One of the best months — score 97 of 100

Typical September days in Flagstaff reach about 74°F with nights near 42°F.

What to pack for Flagstaff in September

• A warm jacket for evenings and early starts.
• Layers — afternoons run about 32° warmer than mornings.
• A compact rain layer — about 8 days see rain in a typical September.

Every packing line is triggered by a number on this page — the rules are on How we pick.

September vs. the alternatives

The whole year in Flagstaff

Averages are the 1991–2020 climate normals (NOAA National Centers for Environmental Information) for the station named on each page. Rain days = days with at least 0.01 in of precipitation. Daylight is computed for the middle of the month.