Clackamas climate

Clackamas Weather in September

NOAA 1991-2020 normals for Oregon City, 6.4 km from Clackamas

Average highs run from 82°F on September 1 to 73°F on September 30, and lows from 56°F to 50°F. Normal precipitation for the month is 1.64 in.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Clackamas, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
53°F
Precipitation
1.64 in
Record high
98°FSep 2, 2017
Record low
37°FSep 27, 1999
Chance of a freeze
0%
Days of 90°F or more
2.7
Daylight
13 h 15 min to 11 h 45 min
Cloud cover
49%
Humidity
68%
Dew point
48°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
Sep 182°F56°F94°F 199844°F 19990%
Sep 282°F55°F98°F 201743°F 20080%
Sep 381°F55°F96°F 202046°F 19990%
Sep 481°F55°F95°F 200345°F 20140%
Sep 581°F55°F98°F 202446°F 20020%
Sep 681°F55°F96°F 202444°F 20020%
Sep 781°F55°F93°F 201143°F 19990%
Sep 880°F54°F89°F 200843°F 20020%
Sep 980°F54°F91°F 201145°F 20070%
Sep 1080°F54°F95°F 201344°F 20080%
Sep 1180°F54°F98°F 201342°F 20120%
Sep 1279°F54°F89°F 201544°F 20120%
Sep 1379°F54°F91°F 199944°F 20030%
Sep 1479°F53°F91°F 200045°F 20160%
Sep 1579°F53°F95°F 202344°F 20030%
Sep 1678°F53°F89°F 200841°F 20210%
Sep 1778°F53°F89°F 201246°F 19990%
Sep 1878°F53°F94°F 199941°F 20050%
Sep 1977°F52°F94°F 199942°F 20050%
Sep 2077°F52°F92°F 201444°F 20010%
Sep 2177°F52°F89°F 199940°F 20050%
Sep 2276°F52°F88°F 199939°F 20000%
Sep 2376°F52°F88°F 200238°F 20080%
Sep 2475°F51°F93°F 202438°F 20050%
Sep 2575°F51°F90°F 202238°F 20050%
Sep 2674°F51°F91°F 202239°F 20050%
Sep 2774°F51°F93°F 200337°F 19990%
Sep 2874°F50°F85°F 201739°F 20050%
Sep 2973°F50°F84°F 202042°F 19990%
Sep 3073°F50°F83°F 200141°F 20190%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Clackamas, in percent, and of at least 0.1 inch of snowfall.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

September 1
sunrise 6:32 AM, sunset 7:47 PM
September 30
sunrise 7:07 AM, sunset 6:52 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00356334 (Oregon City), public domain. Records: NOAA GHCN-Daily, station USW00024242, 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.