Chelan County climate

Chelan County Weather in August

NOAA 1991-2020 normals for Plain, 9.5 km from Chelan County

Average highs run from 84°F on August 1 to 79°F on August 31, and lows from 52°F to 46°F. Normal precipitation for the month is 0.42 in over about 3 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 Chelan County, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
82°F
Average low
49°F
Precipitation
0.42 in
Record high
109°FAug 4, 1961
Record low
42°FAug 23, 1992
Chance of a freeze
3%
Days of 90°F or more
6.3
Daylight
14 h 58 min to 13 h 25 min
Cloud cover
48%
Humidity
70%
Dew point
46°F
Wind
4.0 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°F107°F 200951°F 19879%0%
Aug 284°F52°F103°F 196148°F 19649%0%
Aug 384°F52°F107°F 196152°F 20029%0%
Aug 484°F51°F109°F 196153°F 19629%0%
Aug 584°F51°F102°F 199745°F 19699%0%
Aug 684°F51°F103°F 197250°F 20029%0%
Aug 784°F51°F103°F 197252°F 19849%0%
Aug 884°F51°F104°F 197153°F 19709%0%
Aug 983°F51°F104°F 197150°F 19959%0%
Aug 1083°F51°F104°F 197153°F 19649%0%
Aug 1183°F51°F104°F 197153°F 19669%0%
Aug 1283°F50°F103°F 201553°F 19919%0%
Aug 1383°F50°F102°F 197748°F 19959%0%
Aug 1483°F50°F102°F 199249°F 19829%0%
Aug 1582°F50°F104°F 202349°F 19609%0%
Aug 1682°F50°F103°F 196749°F 19959%0%
Aug 1782°F49°F104°F 200848°F 19989%0%
Aug 1882°F49°F104°F 196747°F 19959%0%
Aug 1982°F49°F103°F 196748°F 197310%0%
Aug 2081°F49°F102°F 197746°F 196810%0%
Aug 2181°F49°F100°F 200546°F 196010%0%
Aug 2281°F48°F100°F 196143°F 196010%0%
Aug 2381°F48°F101°F 196142°F 199211%0%
Aug 2480°F48°F100°F 202544°F 199211%0%
Aug 2580°F48°F101°F 202546°F 199211%0%
Aug 2680°F47°F95°F 198447°F 197611%0%
Aug 2780°F47°F96°F 197247°F 196012%0%
Aug 2880°F47°F99°F 197245°F 198012%0%
Aug 2979°F47°F100°F 199846°F 198012%0%
Aug 3079°F46°F97°F 196745°F 196512%0%
Aug 3179°F46°F99°F 196745°F 199913%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Chelan County, in percent, and of at least 0.1 inch of snowfall.0510151102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

August 1
sunrise 5:39 AM, sunset 8:37 PM
August 31
sunrise 6:20 AM, sunset 7:45 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00456534 (Plain), public domain. Records: NOAA GHCN-Daily, station USW00094239, 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.