Flagstaff weather in August

In August, Flagstaff sees average daytime highs of 77°F and overnight lows near 55°F, with 5.0 in of rain across 16.4 wet days and about 13.3 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 78°F in the first days to 76°F by the end. The sky is clear or mostly clear about 29% of the time in August, and the air most often feels dry.

Daylight stretches from about 13 h 48 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Flagstaff's 11th-clearest and 12th-windiest month. For the whole year in context, see Flagstaff's year-round climate.

Daytime high: 77°; 3rd warmest
Overnight low: 55°; 11th coldest
Rainfall: 5.0 in; 16.4 wet days
Daylight: 13 h 18 min; 5:51 AM – 7:11 PM
Cloud cover: 53%; 11th clearest
Wind: 4 mph; 12th windiest
Solar energy: 6.45 kWh/m²
Travel score: 6.0; out of 10

Flagstaff is city in and county seat of Coconino County, Arizona, United States.

Density: 425/km²; people per km²
Founded: 1876

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← July Flagstaff year-round climate September →Best places to visit in August

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 78°F in the first days to 76°F by the end.

A typical August day in Flagstaff reaches about 77°F in the afternoon and slips back to 55°F overnight — a 22°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 84°F. Set against its neighbours, August runs about 3°F cooler than July and about 5°F warmer than September.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°F)	79	78	78	78	78	78	78	78	78	78	78	78	78	78	78	78	77	77	77	77	77	77	77	76	76	76	76	76	76	76	75
Avg low (°F)	57	56	56	56	56	56	56	56	56	56	56	56	56	55	55	55	55	55	55	55	55	55	55	55	55	54	54	54	54	54	54

	Avg high (°F)	Avg low (°F)
1	79	57
2	78	56
3	78	56
4	78	56
5	78	56
6	78	56
7	78	56
8	78	56
9	78	56
10	78	56
11	78	56
12	78	56
13	78	56
14	78	55
15	78	55
16	78	55
17	77	55
18	77	55
19	77	55
20	77	55
21	77	55
22	77	55
23	77	55
24	76	55
25	76	55
26	76	54
27	76	54
28	76	54
29	76	54
30	76	54
31	75	54

How August really feels in Flagstaff

Once humidity and wind are folded in, August averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Flagstaff weather by month

How August compares with the rest of the year at a glance. August is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	41° / 22°	1.8	6.3	5.6	9.9	0.1
Feb	44° / 24°	2.0	6.9	6.1	10.7	0.8
Mar	50° / 28°	1.9	7.3	5.1	11.7	2.6
Apr	58° / 33°	1.2	5.6	3	12.9	4.9
May	67° / 42°	1.3	5.7	0.8	13.8	7.2
Jun	78° / 51°	0.4	3	0	14.3	8.3
Jul	80° / 57°	4.5	14.8	0	14.1	6.0
Aug	77° / 55°	5.0	16.4	0	13.3	6.0
Sep	72° / 50°	2.3	8.8	0	12.2	7.3
Oct	62° / 40°	1.3	5.2	0.9	11.1	6.4
Nov	50° / 29°	1.3	4.1	3	10.1	2.9
Dec	41° / 22°	1.6	5.8	5.6	9.7	0.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 29% of August, with mostly cloudy or overcast conditions the remaining 42%. Skies tend to open up as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	46	47	49	50	51	52	53	55	56	57	57	59	60	60	61	60	61	61	61	61	61	61	61	61	62	63	63	64	64	65	66
Cloudier (%)	54	53	51	50	49	48	47	45	44	43	43	41	40	40	39	40	39	39	39	39	39	39	39	39	38	37	37	36	36	35	34

	Clearer (%)	Cloudier (%)
1	46	54
2	47	53
3	49	51
4	50	50
5	51	49
6	52	48
7	53	47
8	55	45
9	56	44
10	57	43
11	57	43
12	59	41
13	60	40
14	60	40
15	61	39
16	60	40
17	61	39
18	61	39
19	61	39
20	61	39
21	61	39
22	61	39
23	61	39
24	61	39
25	62	38
26	63	37
27	63	37
28	64	36
29	64	36
30	65	35
31	66	34

Chance of precipitation in August

Any precipitation

Flagstaff gets around 5.0 in of rain over 16.4 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 53% and peaks near 56% on the wettest days. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	56	55	55	54	54	54	54	54	54	54	54	54	54	54	55	55	55	55	55	55	54	54	53	52	52	51	50	49	49	48	47

	Rain chance (%)
1	56
2	55
3	55
4	54
5	54
6	54
7	54
8	54
9	54
10	54
11	54
12	54
13	54
14	54
15	55
16	55
17	55
18	55
19	55
20	55
21	54
22	54
23	53
24	52
25	52
26	51
27	50
28	49
29	49
30	48
31	47

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	82	83	83	84	85	86	87	88	88	89	90	90	91	91	91	91	91	92	92	92	92	92	92	93	93	93	93	94	94	95	95
Comfortable (%)	18	17	17	16	15	14	13	12	12	11	10	10	9	9	9	9	9	8	8	8	8	8	8	7	7	7	7	6	6	5	5

	Dry (%)	Comfortable (%)
1	82	18
2	83	17
3	83	17
4	84	16
5	85	15
6	86	14
7	87	13
8	88	12
9	88	12
10	89	11
11	90	10
12	90	10
13	91	9
14	91	9
15	91	9
16	91	9
17	91	9
18	92	8
19	92	8
20	92	8
21	92	8
22	92	8
23	92	8
24	93	7
25	93	7
26	93	7
27	93	7
28	94	6
29	94	6
30	95	5
31	95	5

Wind in August

Winds average 4 mph in August, the calmest month.

Across August, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (mph)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (mph)	Feels
1	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm
31	4	calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 48 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over August. Sunrise moves from 5:39 AM to 6:02 AM, and sunset from 7:26 PM to 6:51 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	13.8	13.8	13.7	13.7	13.7	13.6	13.6	13.6	13.6	13.5	13.5	13.5	13.4	13.4	13.4	13.3	13.3	13.3	13.2	13.2	13.2	13.1	13.1	13.1	13.0	13.0	13.0	12.9	12.9	12.9	12.8
Sunrise (AM)	5:39	5:40	5:40	5:41	5:42	5:43	5:44	5:44	5:45	5:46	5:47	5:47	5:48	5:49	5:50	5:51	5:51	5:52	5:53	5:54	5:55	5:55	5:56	5:57	5:58	5:58	5:59	6:00	6:01	6:01	6:02
Sunset (PM)	7:26	7:26	7:25	7:24	7:23	7:22	7:21	7:20	7:19	7:18	7:17	7:15	7:14	7:13	7:12	7:11	7:10	7:08	7:07	7:06	7:05	7:03	7:02	7:01	6:59	6:58	6:57	6:55	6:54	6:52	6:51

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.8	5:39	7:26
2	13.8	5:40	7:26
3	13.7	5:40	7:25
4	13.7	5:41	7:24
5	13.7	5:42	7:23
6	13.6	5:43	7:22
7	13.6	5:44	7:21
8	13.6	5:44	7:20
9	13.6	5:45	7:19
10	13.5	5:46	7:18
11	13.5	5:47	7:17
12	13.5	5:47	7:15
13	13.4	5:48	7:14
14	13.4	5:49	7:13
15	13.4	5:50	7:12
16	13.3	5:51	7:11
17	13.3	5:51	7:10
18	13.3	5:52	7:08
19	13.2	5:53	7:07
20	13.2	5:54	7:06
21	13.2	5:55	7:05
22	13.1	5:55	7:03
23	13.1	5:56	7:02
24	13.1	5:57	7:01
25	13.0	5:58	6:59
26	13.0	5:58	6:58
27	13.0	5:59	6:57
28	12.9	6:00	6:55
29	12.9	6:01	6:54
30	12.9	6:01	6:52
31	12.8	6:02	6:51

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.45 kWh/m².

For context, solar energy here swings from a low near 3.08 kWh/m² to a high of 8.41 kWh/m² in June across the year — August's 6.45 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.5	6.5	6.5	6.5	6.5	6.5	6.4	6.4	6.4	6.4	6.3	6.3	6.3	6.3	6.2	6.2	6.2	6.2	6.2	6.1
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	6.6	Intense
2	6.6	Intense
3	6.6	Intense
4	6.6	Intense
5	6.6	Intense
6	6.6	Intense
7	6.6	Intense
8	6.6	Intense
9	6.6	Intense
10	6.6	Intense
11	6.6	Intense
12	6.5	Intense
13	6.5	Intense
14	6.5	Intense
15	6.5	Intense
16	6.5	Intense
17	6.5	Intense
18	6.4	Intense
19	6.4	Intense
20	6.4	Intense
21	6.4	Intense
22	6.3	Intense
23	6.3	Intense
24	6.3	Intense
25	6.3	Intense
26	6.2	Intense
27	6.2	Intense
28	6.2	Intense
29	6.2	Intense
30	6.2	Intense
31	6.1	Intense

Planning a trip in August

Hazard calendar for Flagstaff

In seasonPeak

In August, Flagstaff sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Flagstaff's rainy season runs July–September, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is August a good time to visit Flagstaff?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.0

Sightseeing

5th-best month of the year

5.4

Beach & pool

3rd-best month of the year

August is a reasonable time to visit Flagstaff for sightseeing.

What to pack for Flagstaff in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Flagstaff sees daytime highs around 77°F and nights near 55°F. Pack rain gear and sun protection. Worth having: light clothes. About 16 days see rain.

rain gearsun protectionlight clothes

UV index in Flagstaff in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Flagstaff peaks around June 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	4	6	7	6	8	12	12	11	9	6	4	3
Level	Moderate	High	High	High	Very high	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	4	Moderate
Feb	6	High
Mar	7	High
Apr	6	High
May	8	Very high
Jun	12	Extreme
Jul	12	Extreme
Aug	11	Extreme
Sep	9	Very high
Oct	6	High
Nov	4	Moderate
Dec	3	Moderate

Air quality in Flagstaff in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Flagstaff is worst in June — around 23 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (December, 5 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	7	6	7	10	11	23	10	8	13	16	12	5
Level	Good	Good	Good	Good	Good	Moderate	Good	Good	Moderate	Moderate	Good	Good

	PM2.5 (µg/m³)	Level
Jan	7	Good
Feb	6	Good
Mar	7	Good
Apr	10	Good
May	11	Good
Jun	23	Moderate
Jul	10	Good
Aug	8	Good
Sep	13	Moderate
Oct	16	Moderate
Nov	12	Good
Dec	5	Good

Location & terrain

Where is Flagstaff?

Flagstaff sits at 35.2°N, 111.7°W, 6,903 ft above sea level, in United States. The nearest listed city is Sedona, 24 mi away.

Topography around Flagstaff

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Flagstaff.

Within 2 miles, the terrain around Flagstaff has only modest variations in elevation — a maximum elevation change of 643 ft around an average of 7,014 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 6,017 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,577 ft.

The land around Flagstaff is covered by trees (56%) and artificial surfaces (33%) within 2 miles, trees (76%) within 10 miles, and grassland (38%) and trees (36%) within 50 miles.

2 miles

643 ft

trees 56%

10 miles

6,017 ft

trees 76%

50 miles

9,577 ft

grassland 38%

treesshrubsgrasslandartificial surfacesbare terrain

← July Flagstaff year-round climate September →Best places to visit in August

August weather nearby: Sedona 24 mi · Prescott Valley 55 mi · Prescott 65 mi · Grand Canyon 65 mi · Payson 70 mi · Anthem 96 mi · Deer Valley 108 mi · Fountain Hills 110 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Flagstaff (35.1981°, -111.6513°, elevation 6,903 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°F)	Avg low (°F)
1	79	57
2	78	56
3	78	56
4	78	56
5	78	56
6	78	56
7	78	56
8	78	56
9	78	56
10	78	56
11	78	56
12	78	56
13	78	56
14	78	55
15	78	55
16	78	55
17	77	55
18	77	55
19	77	55
20	77	55
21	77	55
22	77	55
23	77	55
24	76	55
25	76	55
26	76	54
27	76	54
28	76	54
29	76	54
30	76	54
31	75	54

	Clearer (%)	Cloudier (%)
1	46	54
2	47	53
3	49	51
4	50	50
5	51	49
6	52	48
7	53	47
8	55	45
9	56	44
10	57	43
11	57	43
12	59	41
13	60	40
14	60	40
15	61	39
16	60	40
17	61	39
18	61	39
19	61	39
20	61	39
21	61	39
22	61	39
23	61	39
24	61	39
25	62	38
26	63	37
27	63	37
28	64	36
29	64	36
30	65	35
31	66	34

	Rain chance (%)
1	56
2	55
3	55
4	54
5	54
6	54
7	54
8	54
9	54
10	54
11	54
12	54
13	54
14	54
15	55
16	55
17	55
18	55
19	55
20	55
21	54
22	54
23	53
24	52
25	52
26	51
27	50
28	49
29	49
30	48
31	47

	Dry (%)	Comfortable (%)
1	82	18
2	83	17
3	83	17
4	84	16
5	85	15
6	86	14
7	87	13
8	88	12
9	88	12
10	89	11
11	90	10
12	90	10
13	91	9
14	91	9
15	91	9
16	91	9
17	91	9
18	92	8
19	92	8
20	92	8
21	92	8
22	92	8
23	92	8
24	93	7
25	93	7
26	93	7
27	93	7
28	94	6
29	94	6
30	95	5
31	95	5

	Avg high (°F)	Avg low (°F)
1	79	57
2	78	56
3	78	56
4	78	56
5	78	56
6	78	56
7	78	56
8	78	56
9	78	56
10	78	56
11	78	56
12	78	56
13	78	56
14	78	55
15	78	55
16	78	55
17	77	55
18	77	55
19	77	55
20	77	55
21	77	55
22	77	55
23	77	55
24	76	55
25	76	55
26	76	54
27	76	54
28	76	54
29	76	54
30	76	54
31	75	54

	Clearer (%)	Cloudier (%)
1	46	54
2	47	53
3	49	51
4	50	50
5	51	49
6	52	48
7	53	47
8	55	45
9	56	44
10	57	43
11	57	43
12	59	41
13	60	40
14	60	40
15	61	39
16	60	40
17	61	39
18	61	39
19	61	39
20	61	39
21	61	39
22	61	39
23	61	39
24	61	39
25	62	38
26	63	37
27	63	37
28	64	36
29	64	36
30	65	35
31	66	34

	Rain chance (%)
1	56
2	55
3	55
4	54
5	54
6	54
7	54
8	54
9	54
10	54
11	54
12	54
13	54
14	54
15	55
16	55
17	55
18	55
19	55
20	55
21	54
22	54
23	53
24	52
25	52
26	51
27	50
28	49
29	49
30	48
31	47

	Dry (%)	Comfortable (%)
1	82	18
2	83	17
3	83	17
4	84	16
5	85	15
6	86	14
7	87	13
8	88	12
9	88	12
10	89	11
11	90	10
12	90	10
13	91	9
14	91	9
15	91	9
16	91	9
17	91	9
18	92	8
19	92	8
20	92	8
21	92	8
22	92	8
23	92	8
24	93	7
25	93	7
26	93	7
27	93	7
28	94	6
29	94	6
30	95	5
31	95	5

	Avg high (°F)	Avg low (°F)
1	79	57
2	78	56
3	78	56
4	78	56
5	78	56
6	78	56
7	78	56
8	78	56
9	78	56
10	78	56
11	78	56
12	78	56
13	78	56
14	78	55
15	78	55
16	78	55
17	77	55
18	77	55
19	77	55
20	77	55
21	77	55
22	77	55
23	77	55
24	76	55
25	76	55
26	76	54
27	76	54
28	76	54
29	76	54
30	76	54
31	75	54

	Clearer (%)	Cloudier (%)
1	46	54
2	47	53
3	49	51
4	50	50
5	51	49
6	52	48
7	53	47
8	55	45
9	56	44
10	57	43
11	57	43
12	59	41
13	60	40
14	60	40
15	61	39
16	60	40
17	61	39
18	61	39
19	61	39
20	61	39
21	61	39
22	61	39
23	61	39
24	61	39
25	62	38
26	63	37
27	63	37
28	64	36
29	64	36
30	65	35
31	66	34

	Rain chance (%)
1	56
2	55
3	55
4	54
5	54
6	54
7	54
8	54
9	54
10	54
11	54
12	54
13	54
14	54
15	55
16	55
17	55
18	55
19	55
20	55
21	54
22	54
23	53
24	52
25	52
26	51
27	50
28	49
29	49
30	48
31	47

	Dry (%)	Comfortable (%)
1	82	18
2	83	17
3	83	17
4	84	16
5	85	15
6	86	14
7	87	13
8	88	12
9	88	12
10	89	11
11	90	10
12	90	10
13	91	9
14	91	9
15	91	9
16	91	9
17	91	9
18	92	8
19	92	8
20	92	8
21	92	8
22	92	8
23	92	8
24	93	7
25	93	7
26	93	7
27	93	7
28	94	6
29	94	6
30	95	5
31	95	5