Lewistown climate

Lewistown Weather in August

NOAA 1991-2020 normals for Lewistown Muni AP, 2.7 km from Lewistown

Average highs run from 84°F on August 1 to 77°F on August 31, and lows from 52°F to 46°F. Normal precipitation for the month is 1.69 in over about 9 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 Lewistown, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
81°F
Average low
50°F
Precipitation
1.69 in
Record high
103°FAug 5, 1961
Record low
27°FAug 25, 1910
Chance of a freeze
3%
Days of 90°F or more
5.0
Daylight
14 h 53 min to 13 h 23 min
Cloud cover
48%
Humidity
51%
Dew point
44°F
Wind
8.5 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 184°F52°F101°F 202637°F 200230%0%
Aug 284°F52°F96°F 196636°F 193730%0%
Aug 384°F52°F99°F 196133°F 189630%0%
Aug 484°F52°F98°F 196138°F 193730%0%
Aug 584°F52°F103°F 196135°F 193529%0%
Aug 684°F52°F102°F 198337°F 192429%0%
Aug 784°F52°F97°F 200138°F 189629%0%
Aug 883°F52°F96°F 199133°F 189629%0%
Aug 983°F51°F100°F 194031°F 190229%0%
Aug 1083°F51°F100°F 200333°F 190229%0%
Aug 1183°F51°F101°F 201831°F 189629%0%
Aug 1283°F51°F101°F 194031°F 191629%0%
Aug 1382°F51°F97°F 197336°F 191229%0%
Aug 1482°F50°F101°F 192936°F 199529%0%
Aug 1582°F50°F99°F 199033°F 194329%0%
Aug 1682°F50°F98°F 197332°F 190529%0%
Aug 1781°F50°F98°F 190631°F 191029%0%
Aug 1881°F49°F97°F 196433°F 190228%
Aug 1981°F49°F97°F 200831°F 190728%
Aug 2080°F49°F97°F 193132°F 191628%
Aug 2180°F49°F97°F 196929°F 190428%
Aug 2280°F48°F98°F 197634°F 192828%
Aug 2379°F48°F101°F 196933°F 199228%
Aug 2479°F48°F101°F 196931°F 193428%
Aug 2579°F48°F99°F 200827°F 191028%
Aug 2678°F47°F99°F 192630°F 189628%
Aug 2778°F47°F97°F 197130°F 190028%
Aug 2878°F47°F100°F 192433°F 191828%
Aug 2977°F46°F94°F 200532°F 190228%
Aug 3077°F46°F96°F 192930°F 191228%
Aug 3177°F46°F99°F 201634°F 193028%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Lewistown, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

August 1
sunrise 5:57 AM, sunset 8:50 PM
August 31
sunrise 6:36 AM, sunset 7:59 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024036 (Lewistown Muni AP), public domain. Records: NOAA GHCN-Daily, station USW00024036, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.