Climate

Flagstaff weather by month

Average highs, lows, rain and snow for every month, from 30 years of weather records.

Average temperatures

Best time to visit: May, June, September, when highs are mild and rain is lightest.

Month	High	Low	Rain	Snow	Wet days
January	43°F	18°F	2.0 in	20.9 in	7
February	46°F	20°F	2.2 in	19.3 in	8
March	52°F	24°F	1.9 in	15.6 in	7
April	59°F	28°F	0.90 in	5.0 in	5
May	68°F	35°F	0.80 in	1.1 in	5
June	79°F	43°F	0.30 in	0.00 in	2
July	82°F	51°F	2.6 in	0.00 in	12
August	79°F	51°F	3.0 in	0.00 in	13
September	74°F	43°F	1.8 in	0.00 in	8
October	64°F	32°F	1.5 in	1.5 in	5
November	52°F	23°F	1.6 in	8.2 in	4
December	43°F	17°F	1.9 in	18.5 in	7

NOAA U.S. Climate Normals 1991–2020, Flagstaff Pulliam Ap, Az Us (3.6 mi away, 7,003 ft). Wet days: days with at least 0.01 in of precipitation.

What is the hottest month in Flagstaff?

July, with an average high of 82°F and low of 51°F.

What is the coldest month in Flagstaff?

December, with an average low of 17°F and high of 43°F.

When does it rain most in Flagstaff?

August is the wettest month, averaging 3.0 in of precipitation; the year totals about 20.5 inches.

Does it snow in Flagstaff?

Yes. Snowfall averages about 90 inches a year, mostly in January and February.

What is the best time to visit Flagstaff?

For mild weather (highs between 65°F and 85°F) with the least rain, May, June, September.

Where do these numbers come from?

NOAA’s 1991–2020 U.S. Climate Normals for the Flagstaff Pulliam Ap weather station, 3.6 miles from downtown: 30-year averages, not a forecast.