Flagstaff climate

Flagstaff Weather in August

NOAA 1991-2020 normals for Flagstaff Pulliam AP, 6.1 km from Flagstaff

Average highs run from 81°F on August 1 to 78°F on August 31, and lows from 53°F to 48°F. Normal precipitation for the month is 3.04 in over about 13 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Flagstaff, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
79°F
Average low
51°F
Precipitation
3.04 in
Record high
95°FAug 12, 1940
Record low
24°FAug 23, 1968
Chance of a freeze
0%
Days of 90°F or more
0.6
Daylight
13 h 54 min to 12 h 56 min
Cloud cover
52%
Humidity
50%
Dew point
48°F
Wind
6.5 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 181°F53°F92°F 193844°F 197644%0%
Aug 281°F53°F90°F 193843°F 197644%0%
Aug 381°F53°F91°F 199437°F 195645%0%
Aug 480°F52°F91°F 199435°F 195645%0%
Aug 580°F52°F89°F 189535°F 197645%0%
Aug 680°F52°F90°F 197536°F 195345%0%
Aug 780°F52°F92°F 197839°F 199144%0%
Aug 880°F52°F91°F 189835°F 200944%0%
Aug 980°F52°F92°F 189835°F 200944%0%
Aug 1080°F52°F89°F 189840°F 200944%0%
Aug 1180°F52°F92°F 189842°F 195144%0%
Aug 1280°F52°F95°F 194036°F 199944%0%
Aug 1380°F51°F92°F 189839°F 199944%0%
Aug 1480°F51°F94°F 189833°F 197644%0%
Aug 1579°F51°F91°F 202033°F 196843%0%
Aug 1679°F51°F93°F 202037°F 196843%0%
Aug 1779°F51°F91°F 202038°F 196043%0%
Aug 1879°F51°F93°F 189836°F 197542%0%
Aug 1979°F50°F91°F 189835°F 197942%0%
Aug 2079°F50°F90°F 200935°F 197942%0%
Aug 2179°F50°F90°F 199133°F 197942%0%
Aug 2279°F50°F90°F 202032°F 196841%0%
Aug 2379°F50°F90°F 198524°F 196841%0%
Aug 2479°F49°F91°F 198530°F 196840%0%
Aug 2579°F49°F88°F 198536°F 200240%0%
Aug 2678°F49°F90°F 202637°F 198939%0%
Aug 2778°F49°F92°F 192636°F 197839%0%
Aug 2878°F48°F87°F 197635°F 197538%0%
Aug 2978°F48°F89°F 202337°F 195638%0%
Aug 3078°F48°F87°F 189836°F 194237%0%
Aug 3178°F48°F89°F 195035°F 195736%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Flagstaff, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MST).

August 1
sunrise 5:36 AM, sunset 7:30 PM
August 31
sunrise 5:59 AM, sunset 6:55 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00003103 (Flagstaff Pulliam AP), public domain. Records: NOAA GHCN-Daily, station USW00003103, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.