Lake Oswego climate

Lake Oswego Weather in August

NOAA 1991-2020 normals for Portland Kgw-TV, 10.9 km from Lake Oswego

Average highs run from 82°F on August 1 to 79°F on August 31, and lows from 59°F to 58°F. Normal precipitation for the month is 0.54 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 Lake Oswego, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
81°F
Average low
59°F
Precipitation
0.54 in
Record high
108°FAug 14, 2023
Record low
44°FAug 29, 1951
Chance of a freeze
0%
Days of 90°F or more
4.1
Daylight
14 h 43 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 182°F59°F99°F 202447°F 19578%0%
Aug 282°F59°F103°F 201750°F 19598%0%
Aug 382°F59°F105°F 201747°F 19508%0%
Aug 482°F59°F102°F 201251°F 19509%0%
Aug 582°F59°F100°F 194548°F 19509%0%
Aug 682°F59°F102°F 197249°F 19509%0%
Aug 782°F59°F104°F 197249°F 19749%0%
Aug 882°F59°F107°F 198149°F 19709%0%
Aug 982°F59°F105°F 198148°F 19549%0%
Aug 1081°F59°F107°F 198150°F 19479%0%
Aug 1181°F59°F102°F 197750°F 19669%0%
Aug 1281°F59°F104°F 197749°F 195710%0%
Aug 1381°F59°F102°F 200245°F 194910%0%
Aug 1481°F59°F108°F 202347°F 196410%0%
Aug 1581°F59°F103°F 202351°F 194410%0%
Aug 1681°F59°F103°F 202347°F 196910%0%
Aug 1781°F59°F105°F 197745°F 197011%0%
Aug 1880°F59°F99°F 201645°F 197311%0%
Aug 1980°F59°F100°F 201646°F 194711%0%
Aug 2080°F58°F100°F 201646°F 194712%0%
Aug 2180°F58°F95°F 194545°F 195512%0%
Aug 2280°F58°F102°F 202547°F 195513%0%
Aug 2380°F58°F101°F 198848°F 195113%0%
Aug 2480°F58°F99°F 198247°F 199213%0%
Aug 2580°F58°F95°F 201647°F 195714%0%
Aug 2679°F58°F100°F 198646°F 196214%0%
Aug 2779°F58°F98°F 201947°F 196215%0%
Aug 2879°F58°F102°F 196745°F 198015%0%
Aug 2979°F58°F95°F 194044°F 195116%0%
Aug 3079°F58°F100°F 202246°F 195116%0%
Aug 3179°F58°F102°F 198744°F 195116%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Lake Oswego, 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 5:55 AM, sunset 8:38 PM
August 31
sunrise 6:31 AM, sunset 7:50 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00356749 (Portland Kgw-TV), 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.