Mill Plain climate

Mill Plain Weather in August

NOAA 1991-2020 normals for Portland WFO, 9.8 km from Mill Plain

Average highs run from 83°F on August 1 to 80°F on August 31, and lows from 58°F to 56°F. Normal precipitation for the month is 0.62 in over about 4 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 Mill Plain, 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
57°F
Precipitation
0.62 in
Record high
108°FAug 14, 2023
Record low
44°FAug 29, 1951
Chance of a freeze
0%
Days of 90°F or more
6.0
Daylight
14 h 44 min to 13 h 19 min
Cloud cover
44%
Humidity
66%
Dew point
52°F
Wind
4.3 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 183°F58°F99°F 202447°F 19579%0%
Aug 283°F58°F103°F 201750°F 19599%0%
Aug 383°F58°F105°F 201747°F 195010%0%
Aug 483°F58°F102°F 201251°F 195010%0%
Aug 583°F58°F100°F 194548°F 195010%0%
Aug 683°F58°F102°F 197249°F 195010%0%
Aug 783°F58°F104°F 197249°F 197410%0%
Aug 883°F58°F107°F 198149°F 197010%0%
Aug 983°F58°F105°F 198148°F 195410%0%
Aug 1083°F58°F107°F 198150°F 194710%0%
Aug 1183°F58°F102°F 197750°F 196611%0%
Aug 1283°F58°F104°F 197749°F 195711%0%
Aug 1382°F58°F102°F 200245°F 194911%0%
Aug 1482°F58°F108°F 202347°F 196411%0%
Aug 1582°F58°F103°F 202351°F 194411%0%
Aug 1682°F58°F103°F 202347°F 196912%0%
Aug 1782°F57°F105°F 197745°F 197012%0%
Aug 1882°F57°F99°F 201645°F 197312%0%
Aug 1982°F57°F100°F 201646°F 194712%0%
Aug 2082°F57°F100°F 201646°F 194713%0%
Aug 2181°F57°F95°F 194545°F 195513%0%
Aug 2281°F57°F102°F 202547°F 195514%0%
Aug 2381°F57°F101°F 198848°F 195114%0%
Aug 2481°F57°F99°F 198247°F 199214%0%
Aug 2581°F57°F95°F 201647°F 195715%0%
Aug 2681°F56°F100°F 198646°F 196215%0%
Aug 2781°F56°F98°F 201947°F 196216%0%
Aug 2881°F56°F102°F 196745°F 198016%0%
Aug 2980°F56°F95°F 194044°F 195116%0%
Aug 3080°F56°F100°F 202246°F 195117%0%
Aug 3180°F56°F102°F 198744°F 195117%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Mill Plain, 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 (PDT).

August 1
sunrise 5:54 AM, sunset 8:38 PM
August 31
sunrise 6:30 AM, sunset 7:49 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00356750 (Portland WFO), public domain. Records: NOAA GHCN-Daily, station USW00024229, 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.