Helena climate

Helena Weather in August

NOAA 1991-2020 normals for Helena Rgnl AP, 5.7 km from Helena

Average highs run from 89°F on August 1 to 80°F on August 31, and lows from 56°F to 49°F. Normal precipitation for the month is 1.04 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 Helena, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
85°F
Average low
53°F
Precipitation
1.04 in
Snowfall
0.3 in
Record high
105°FAug 24, 1969
Record low
28°FAug 25, 1992
Chance of a freeze
1%
Days of 90°F or more
10.6
Daylight
14 h 50 min to 13 h 22 min
Cloud cover
46%
Humidity
53%
Dew point
43°F
Wind
5.1 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 189°F56°F103°F 202642°F 199521%0%
Aug 288°F56°F101°F 202446°F 196321%0%
Aug 388°F56°F103°F 202443°F 197221%0%
Aug 488°F56°F102°F 196141°F 193821%0%
Aug 588°F56°F103°F 196142°F 194021%0%
Aug 688°F56°F103°F 199043°F 199621%0%
Aug 788°F55°F100°F 199038°F 193921%0%
Aug 887°F55°F99°F 199036°F 193920%0%
Aug 987°F55°F102°F 194039°F 199520%0%
Aug 1087°F55°F102°F 200336°F 193920%0%
Aug 1187°F54°F98°F 201840°F 194720%0%
Aug 1286°F54°F103°F 194041°F 198720%0%
Aug 1386°F54°F98°F 201539°F 194220%0%
Aug 1486°F54°F99°F 200336°F 199520%0%
Aug 1585°F53°F102°F 202340°F 194420%0%
Aug 1685°F53°F99°F 202242°F 195420%0%
Aug 1785°F53°F102°F 202338°F 198520%0%
Aug 1884°F53°F100°F 200139°F 195420%0%
Aug 1984°F52°F98°F 200834°F 199520%0%
Aug 2084°F52°F96°F 195337°F 193820%0%
Aug 2183°F52°F95°F 199139°F 193820%0%
Aug 2283°F51°F97°F 200633°F 199220%0%
Aug 2382°F51°F98°F 196733°F 199220%0%
Aug 2482°F51°F105°F 196933°F 199220%0%
Aug 2582°F51°F97°F 196628°F 199220%0%
Aug 2681°F50°F97°F 201035°F 199220%0%
Aug 2781°F50°F98°F 200137°F 199320%0%
Aug 2881°F50°F97°F 201236°F 197720%0%
Aug 2980°F49°F99°F 200537°F 197520%0%
Aug 3080°F49°F96°F 199934°F 199320%0%
Aug 3180°F49°F97°F 202232°F 195620%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Helena, 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 6:09 AM, sunset 8:59 PM
August 31
sunrise 6:47 AM, sunset 8:09 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024144 (Helena Rgnl AP), public domain. Records: NOAA GHCN-Daily, station USW00024144, 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.