Lewis and Clark County climate

Lewis and Clark County Weather in August

NOAA 1991-2020 normals for Rogers Pass 9 Nne, 10.7 km from Lewis and Clark County

Average highs run from 84°F on August 1 to 76°F on August 31, and lows from 52°F to 45°F. Normal precipitation for the month is 1.24 in over about 7 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 Lewis and Clark County, 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
49°F
Precipitation
1.24 in
Record high
100°FAug 22, 1969
Record low
28°FAug 25, 1992
Chance of a freeze
14%
Days of 90°F or more
4.8
Daylight
14 h 53 min to 13 h 23 min
Cloud cover
47%
Humidity
55%
Dew point
42°F
Wind
4.5 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°F96°F 200337°F 200221%0%
Aug 284°F52°F96°F 196638°F 197821%0%
Aug 384°F52°F95°F 196634°F 198921%0%
Aug 484°F52°F94°F 196938°F 200621%0%
Aug 584°F51°F96°F 198840°F 201821%0%
Aug 684°F51°F97°F 198337°F 198821%0%
Aug 783°F51°F97°F 198338°F 196721%0%
Aug 883°F51°F96°F 199040°F 197721%0%
Aug 983°F51°F98°F 201238°F 197721%0%
Aug 1083°F51°F99°F 200338°F 200421%0%
Aug 1182°F50°F96°F 199134°F 199721%0%
Aug 1282°F50°F94°F 196735°F 197721%0%
Aug 1382°F50°F95°F 201533°F 196821%0%
Aug 1482°F50°F97°F 201535°F 200221%0%
Aug 1581°F49°F95°F 199037°F 198721%0%
Aug 1681°F49°F97°F 199030°F 200221%0%
Aug 1781°F49°F92°F 197139°F 198521%0%
Aug 1880°F49°F95°F 200837°F 197821%0%
Aug 1980°F48°F95°F 200133°F 196621%0%
Aug 2080°F48°F95°F 196936°F 198621%0%
Aug 2179°F48°F97°F 196936°F 201521%0%
Aug 2279°F48°F100°F 196930°F 199220%0%
Aug 2379°F47°F99°F 196930°F 199220%0%
Aug 2479°F47°F99°F 196931°F 199220%0%
Aug 2578°F47°F98°F 196928°F 199220%0%
Aug 2678°F46°F93°F 200329°F 199220%0%
Aug 2778°F46°F94°F 201034°F 201820%0%
Aug 2877°F46°F94°F 201233°F 199420%0%
Aug 2977°F46°F94°F 200533°F 199420%0%
Aug 3076°F45°F94°F 199830°F 199320%0%
Aug 3176°F45°F94°F 199928°F 200620%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Lewis and Clark County, 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 9:02 PM
August 31
sunrise 6:48 AM, sunset 8:11 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00247159 (Rogers Pass 9 Nne), public domain. Records: NOAA GHCN-Daily, station USC00247159, 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.