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Flagstaff September Weather

Averages and records for weather in Flagstaff, Arizona in the month of September.

Typical Flagstaff September Weather 1991–2020
Average daily high	74.1 °F
Average daily low	42.5 °F
Average monthly precipitation	1.8 inches
Average monthly snow	none
Daily chance of precipitation	25.1%
Daily chance of snow	0%

Flagstaff September Weather Records 1893–2024
Highest temperature	91 °F	September 6, 2020
Lowest temperature	22 °F	September 26, 1934
Highest daily low	62 °F	September 2, 1897
Lowest daily high	41 °F	September 24, 1986
Hottest average high temperature	80.5 °F	1956
Coldest average high temperature	66.1 °F	1906
Most daily precipitation	2.8 inches	September 5, 1970
Most monthly precipitation	6.8 inches	1983
Most daily snow	2.0 inches	September 19, 1965
Most monthly snow	2.0 inches	1965

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
September 1	76.9	47.3	90	33
September 2	76.7	47.1	88	35
September 3	76.5	46.8	89	34
September 4	76.3	46.4	90	27
September 5	76.1	46.1	90	31
September 6	75.9	45.8	91	33
September 7	75.8	45.5	89	35
September 8	75.6	45.1	88	33
September 9	75.3	44.8	87	31
September 10	75.2	44.4	87	26
September 11	75.0	44.1	88	30
September 12	74.8	43.7	88	25
September 13	74.6	43.4	89	26
September 14	74.4	43.0	88	29
September 15	74.2	42.7	87	30
September 16	74.0	42.2	88	28
September 17	73.8	41.9	88	30
September 18	73.5	41.5	86	27
September 19	73.2	41.2	84	25
September 20	72.9	40.9	83	23
September 21	72.5	40.4	81	23
September 22	72.1	39.9	80	27
September 23	71.8	39.4	83	25
September 24	71.5	39.0	82	25
September 25	71.3	38.6	83	24
September 26	71.0	38.3	82	22
September 27	70.7	37.9	83	26
September 28	70.3	37.5	83	24
September 29	70.1	37.1	83	26
September 30	69.9	36.8	83	27

Weather Station Details

Years	Station	Coordinates
1893–2024	Flagstaff Pulliam Airport	location