Corvallis climate

Corvallis Weather in September

NOAA 1991-2020 normals for Western Ag Rsch Ctr, 2.7 km from Corvallis

Average highs run from 79°F on September 1 to 67°F on September 30, and lows from 45°F to 37°F. Normal precipitation for the month is 0.93 in over about 8 wet days.

September day by day

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

Normal daily high and low temperature at Corvallis, in °F, with the record for each date.020406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
73°F
Average low
41°F
Precipitation
0.93 in
Record high
98°FSep 1, 1967
Record low
10°FSep 7, 1895
Chance of a freeze
79%
Days of 90°F or more
0.6
Daylight
13 h 18 min to 11 h 44 min
Cloud cover
51%
Humidity
57%
Dew point
34°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 179°F45°F98°F 196728°F 189523%0%
Sep 278°F44°F98°F 199829°F 189523%0%
Sep 378°F44°F94°F 193128°F 189523%0%
Sep 478°F44°F94°F 199824°F 189524%0%
Sep 577°F44°F95°F 195519°F 189524%0%
Sep 677°F44°F94°F 202017°F 189524%0%
Sep 777°F43°F98°F 193110°F 189524%0%
Sep 876°F43°F94°F 202221°F 189524%0%
Sep 976°F43°F92°F 202128°F 189524%0%
Sep 1076°F43°F95°F 193528°F 189525%0%
Sep 1175°F42°F95°F 193527°F 189525%0%
Sep 1275°F42°F92°F 195320°F 189525%0%
Sep 1374°F42°F93°F 201520°F 189525%0%
Sep 1474°F42°F90°F 194819°F 189525%0%
Sep 1574°F41°F92°F 200222°F 189525%0%
Sep 1673°F41°F87°F 198921°F 189525%0%
Sep 1773°F41°F92°F 200919°F 189525%0%
Sep 1872°F41°F90°F 198424°F 196525%0%
Sep 1972°F40°F90°F 190127°F 196525%0%
Sep 2072°F40°F87°F 189919°F 189525%0%
Sep 2171°F40°F94°F 193616°F 189525%0%
Sep 2271°F40°F89°F 193816°F 189525%0%
Sep 2370°F39°F87°F 190317°F 189525%0%
Sep 2470°F39°F91°F 201118°F 193425%0%
Sep 2569°F39°F94°F 201425°F 193325%0%
Sep 2669°F38°F90°F 201521°F 197225%0%
Sep 2768°F38°F90°F 189925°F 196126%0%
Sep 2868°F38°F87°F 196725°F 199926%0%
Sep 2967°F37°F89°F 201021°F 198526%0%
Sep 3067°F37°F86°F 196318°F 198526%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Corvallis, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 6:57 AM, sunset 8:15 PM
September 30
sunrise 7:34 AM, sunset 7:18 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00248783 (Western Ag Rsch Ctr), public domain. Records: NOAA GHCN-Daily, station USC00243885, 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.