Custer County climate

Custer County Weather in August

NOAA 1991-2020 normals for Challis AP, 31.8 km from Custer County

Average highs run from 89°F on August 1 to 81°F on August 31, and lows from 53°F to 46°F. Normal precipitation for the month is 0.45 in over about 5 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 Custer County, 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
50°F
Precipitation
0.45 in
Record high
102°FAug 10, 2018
Record low
33°FAug 31, 2006
Chance of a freeze
2%
Days of 90°F or more
9.2
Daylight
14 h 36 min to 13 h 16 min
Cloud cover
39%
Humidity
44%
Dew point
32°F
Wind
5.4 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation.

DateNormal highNormal lowRecord highRecord lowChance wet
Aug 189°F53°F100°F 202641°F 200117%
Aug 288°F53°F99°F 202043°F 201317%
Aug 388°F53°F95°F 202045°F 202517%
Aug 488°F52°F94°F 201942°F 201617%
Aug 588°F52°F96°F 201243°F 202517%
Aug 688°F52°F98°F 200144°F 200717%
Aug 788°F52°F98°F 200144°F 201517%
Aug 887°F52°F96°F 200040°F 200217%
Aug 987°F52°F98°F 201839°F 200217%
Aug 1087°F51°F102°F 201838°F 201617%
Aug 1187°F51°F99°F 201843°F 200716%
Aug 1286°F51°F96°F 201842°F 201916%
Aug 1386°F51°F97°F 200341°F 200616%
Aug 1486°F51°F98°F 200342°F 201016%
Aug 1585°F50°F97°F 202337°F 200916%
Aug 1685°F50°F97°F 201338°F 200916%
Aug 1785°F50°F98°F 202039°F 200916%
Aug 1885°F50°F98°F 202239°F 200616%
Aug 1984°F49°F97°F 202540°F 200016%
Aug 2084°F49°F96°F 202640°F 200716%
Aug 2184°F49°F98°F 200941°F 200016%
Aug 2283°F49°F96°F 200936°F 200216%
Aug 2383°F48°F93°F 202036°F 201616%
Aug 2483°F48°F95°F 201139°F 200416%
Aug 2582°F48°F93°F 200836°F 201216%
Aug 2682°F48°F97°F 201138°F 200516%
Aug 2782°F47°F95°F 200136°F 200416%
Aug 2881°F47°F94°F 201238°F 201815%
Aug 2981°F47°F94°F 201738°F 202415%
Aug 3081°F47°F94°F 202238°F 201215%
Aug 3181°F46°F94°F 202233°F 200615%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Custer County, in percent.051015201102030
  • Chance of a wet day

Sunrise and sunset

Times for 2026, local time (MDT).

August 1
sunrise 6:25 AM, sunset 9:01 PM
August 31
sunrise 6:59 AM, sunset 8:15 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00004114 (Challis AP), public domain. Records: NOAA GHCN-Daily, station USW00004114, 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.