Roundup climate

Roundup Weather in August

NOAA 1991-2020 normals for Roundup, 1.1 km from Roundup

Average highs run from 91°F on August 1 to 84°F on August 31, and lows from 55°F to 47°F. Normal precipitation for the month is 1.21 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 Roundup, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
88°F
Average low
51°F
Precipitation
1.21 in
Record high
106°FAug 10, 1935
Record low
29°FAug 25, 1992
Chance of a freeze
6%
Days of 90°F or more
15.7
Daylight
14 h 50 min to 13 h 22 min
Cloud cover
47%
Humidity
44%
Dew point
44°F
Wind
8.3 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 191°F55°F100°F 202641°F 195019%0%
Aug 291°F54°F99°F 202639°F 193719%0%
Aug 391°F54°F103°F 196138°F 197419%0%
Aug 491°F54°F104°F 196141°F 195518%0%
Aug 591°F54°F105°F 196138°F 198018%0%
Aug 691°F54°F105°F 194937°F 200618%0%
Aug 790°F54°F102°F 198340°F 195718%0%
Aug 890°F53°F99°F 195838°F 193918%0%
Aug 990°F53°F100°F 193640°F 196018%0%
Aug 1090°F53°F106°F 193539°F 196017%0%
Aug 1190°F53°F101°F 198332°F 191417%0%
Aug 1289°F53°F102°F 194036°F 198717%0%
Aug 1389°F52°F102°F 193538°F 200517%0%
Aug 1489°F52°F101°F 197133°F 195917%0%
Aug 1589°F52°F100°F 199036°F 194417%0%
Aug 1688°F51°F100°F 197334°F 193817%0%
Aug 1788°F51°F98°F 202335°F 200217%0%
Aug 1888°F51°F101°F 194835°F 197817%0%
Aug 1987°F50°F97°F 194236°F 195016%0%
Aug 2087°F50°F98°F 197134°F 195616%0%
Aug 2187°F50°F99°F 196930°F 194516%0%
Aug 2287°F50°F104°F 197637°F 199216%0%
Aug 2386°F49°F102°F 196933°F 196616%0%
Aug 2486°F49°F102°F 196933°F 193416%0%
Aug 2586°F49°F99°F 198529°F 199216%0%
Aug 2685°F48°F97°F 193733°F 191416%0%
Aug 2785°F48°F98°F 197133°F 195416%0%
Aug 2885°F48°F98°F 193935°F 196016%0%
Aug 2984°F47°F96°F 193836°F 193716%0%
Aug 3084°F47°F99°F 193632°F 198017%0%
Aug 3184°F47°F103°F 195534°F 199217%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Roundup, in percent, and of at least 0.1 inch of snowfall.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

August 1
sunrise 5:55 AM, sunset 8:45 PM
August 31
sunrise 6:33 AM, sunset 7:55 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00247214 (Roundup), public domain. Records: NOAA GHCN-Daily, station USC00243727, 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.