Great Falls climate

Great Falls Weather in August

NOAA 1991-2020 normals for Great Falls 16ST, 2.1 km from Great Falls

Average highs run from 87°F on August 1 to 79°F on August 31, and lows from 56°F to 49°F. Normal precipitation for the month is 1.30 in over about 6 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 Great Falls, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
84°F
Average low
53°F
Precipitation
1.30 in
Snowfall
0.3 in
Record high
106°FAug 5, 1961
Record low
30°FAug 24, 1992
Chance of a freeze
0%
Days of 90°F or more
8.2
Daylight
14 h 56 min to 13 h 24 min
Cloud cover
47%
Humidity
49%
Dew point
45°F
Wind
7.4 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 187°F56°F102°F 202638°F 199917%0%
Aug 287°F56°F98°F 196141°F 200217%0%
Aug 387°F56°F100°F 196140°F 200217%0%
Aug 487°F56°F102°F 196138°F 202617%0%
Aug 587°F56°F106°F 196142°F 202617%0%
Aug 687°F56°F104°F 198342°F 198017%0%
Aug 786°F56°F101°F 197035°F 193917%0%
Aug 886°F55°F102°F 201243°F 199718%0%
Aug 986°F55°F101°F 194042°F 195018%0%
Aug 1086°F55°F104°F 198440°F 193918%0%
Aug 1186°F55°F101°F 199640°F 197718%0%
Aug 1285°F55°F105°F 194038°F 196618%0%
Aug 1385°F55°F99°F 201540°F 200519%0%
Aug 1485°F54°F101°F 197136°F 199519%0%
Aug 1585°F54°F101°F 199040°F 198219%0%
Aug 1684°F54°F101°F 201339°F 200219%0%
Aug 1784°F54°F101°F 202336°F 200219%0%
Aug 1884°F53°F101°F 196440°F 198720%0%
Aug 1983°F53°F100°F 202540°F 197320%0%
Aug 2083°F53°F98°F 197140°F 199520%0%
Aug 2183°F52°F98°F 196938°F 199220%0%
Aug 2283°F52°F98°F 197632°F 199220%0%
Aug 2382°F52°F102°F 196932°F 199220%0%
Aug 2482°F52°F106°F 196930°F 199221%0%
Aug 2582°F51°F100°F 197031°F 199221%0%
Aug 2681°F51°F96°F 201038°F 195721%0%
Aug 2781°F51°F98°F 197139°F 201821%0%
Aug 2880°F50°F99°F 201236°F 201821%0%
Aug 2980°F50°F97°F 200534°F 199222%0%
Aug 3080°F50°F97°F 199935°F 199322%0%
Aug 3179°F49°F98°F 194037°F 197722%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Great Falls, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

August 1
sunrise 6:03 AM, sunset 8:59 PM
August 31
sunrise 6:43 AM, sunset 8:07 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00243749 (Great Falls 16ST), public domain. Records: NOAA GHCN-Daily, station USW00024143, 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.