United States · 1991–2020

Best time to visit
Flagstaff.

September leads for comfortable weather in Flagstaff: typically 23.4°C by day, 5.8°C at night, with 46 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.4°C

Typical low5.8°C

Rain in September46 mm

Comfort

September

September · June · August

78climate match

Beach

July

July · June · August

57climate match

Outdoors

May

May · September · June

85climate match

The weakest month is January, scoring 5 against September’s 78 — days reach only 6.3°C, 18° below the 24°C the score treats as ideal, and nights drop to -8°C.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

56.3° / -8°

Feb

57.6° / -6.8°

Mar

1911.3° / -4.5°

Apr

3915.1° / -2.1°

May

6320.1° / 1.5°

Jun

7626.2° / 5.7°

Jul

7027.8° / 10.7°

Aug

7226.3° / 10.3°

Sep

7823.4° / 5.8°

Oct

5017.5° / -0.2°

Nov

2011.1° / -4.9°

Dec

56.1° / -8.3°

Monthly climate evidence for Flagstaff — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	6.3°C	-8°C	52 mm	5.6	10 h 01	5	Strong coverage
February	7.6°C	-6.8°C	55 mm	6.2	10 h 51	5	Strong coverage
March	11.3°C	-4.5°C	48 mm	5.2	11 h 52	19	Strong coverage
April	15.1°C	-2.1°C	23 mm	3.5	13 h 02	39	Strong coverage
May	20.1°C	1.5°C	20 mm	3.4	14 h	63	Strong coverage
June	26.2°C	5.7°C	8 mm	1.4	14 h 31	76	Strong coverage
July	27.8°C	10.7°C	66 mm	8.5	14 h 19	70	Strong coverage
August	26.3°C	10.3°C	77 mm	9.7	13 h 29	72	Strong coverage
September	23.4°C	5.8°C	46 mm	5.3	12 h 21	78	Strong coverage
October	17.5°C	-0.2°C	39 mm	4	11 h 14	50	Strong coverage
November	11.1°C	-4.9°C	39 mm	3.8	10 h 16	20	Strong coverage
December	6.1°C	-8.3°C	48 mm	5.3	9 h 48	5	Strong coverage

What has changed

Flagstaff runs +0.8°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+0.7

Feb

+0.4

Mar

+1.6

Apr

+1.7

May

0.0

Jun

+1.4

Jul

+0.1

Aug

+0.3

Sep

+0.8

Oct

+0.8

Nov

+1.2

Dec

+0.8

September daytime highs, 2011–2025. Last recorded: 23.0°C.

Records at FLAGSTAFF AP, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C30 Jan 1971	-34.4°C22 Jan 1937	86 mm21 Jan 2010	310 mm1895 · driest 0 mm in 1972	100
February	21.7°C26 Feb 1986	-30.6°C1 Feb 1985	100 mm19 Feb 1993	255 mm1993 · driest 0 mm in 1967	101
March	28.9°C19 Mar 2026	-26.7°C4 Mar 1966	71 mm1 Mar 1970	185 mm2023 · driest 0 mm in 1972	101
April	28.3°C27 Apr 1898	-18.9°C2 Apr 1975	46 mm16 Apr 1934	143 mm1965 · driest 0 mm in 2008	102
May	33.9°C27 May 1896	-10.0°C9 May 1930	28 mm24 May 1965	105 mm1992 · driest 0 mm in 1970	100
June	35.6°C28 Jun 2013	-5.6°C2 Jun 1951	61 mm29 Jun 1956	74 mm1955 · driest 0 mm in 1974	101
July	37.2°C28 Jul 1898	0.0°C8 Jul 1955	65 mm15 Jul 1964	192 mm2013 · driest 0 mm in 1993	103
August	35.0°C12 Aug 1940	-4.4°C23 Aug 1968	77 mm13 Aug 1986	205 mm1986 · driest 5 mm in 1897	101
September	32.8°C6 Sep 2020	-5.6°C26 Sep 1934	72 mm5 Sep 1970	171 mm1983 · driest 0 mm in 1992	99
October	29.4°C1 Oct 1980	-18.9°C30 Oct 1971	62 mm24 Oct 1992	251 mm1972 · driest 0 mm in 1952	99
November	23.3°C10 Nov 1897	-25.0°C18 Nov 1958	82 mm11 Nov 1978	193 mm1905 · driest 0 mm in 1980	101
December	20.0°C11 Dec 1950	-30.6°C8 Dec 1978	85 mm29 Dec 2004	185 mm1967 · driest 0 mm in 1958	102

Typical days per month at FLAGSTAFF AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	2	6
February	0	0	28	1	6
March	0	0	29	1	5
April	<1	0	24	<1	2
May	5	<1	11	<1	<1
June	21	5	2	<1	0
July	26	8	0	2	0
August	22	4	0	2	0
September	12	<1	2	2	0
October	2	0	18	1	<1
November	0	0	28	1	2
December	0	0	30	2	6

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 77); on 2011–2025 it is September (84). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in FLAGSTAFF AP’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	19%	6%	20%	2.9–8.4°C
February	<1%	21%	6%	24%	4.1–10.5°C
March	2%	20%	5%	21%	6.9–13.5°C
April	18%	14%	3%	10%	12.1–17.5°C
May	57%	10%	2%	7%	16.7–22.4°C
June	87%	7%	<1%	5%	23.4–28.0°C
July	72%	28%	7%	39%	26.4–29.1°C
August	69%	31%	7%	38%	24.6–27.7°C
September	73%	18%	5%	16%	20.9–25.0°C
October	36%	13%	4%	11%	14.9–20.3°C
November	4%	14%	5%	12%	7.7–14.4°C
December	<1%	18%	6%	19%	3.5–10.1°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1894Each stripe is one year’s mean temperature against the 92-year average. Warmest: 1981. Coolest: 1979.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5294810
NOAA station: USW00003103 · FLAGSTAFF AP
Station distance: 6.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 35.20°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from FLAGSTAFF AP is what differs

Kachina Village→Mountainaire→Cogdill Center→East Flagstaff→Fort Tuthill→Arrowhead Village Mobile Home Park→

Or put two places side by side: Flagstaff vs Kachina Village

Best time to visitFlagstaff.

September

July

May

The whole year,without the guesswork.

Flagstaff runs +0.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Flagstaff.

The whole year,
without the guesswork.

Flagstaff runs +0.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.