Benton County climate

Benton County Weather in September

NOAA 1991-2020 normals for Corvallis Water Bureau, 2.9 km from Benton County

Average highs run from 81°F on September 1 to 73°F on September 30, and lows from 44°F to 40°F. Normal precipitation for the month is 1.75 in over about 7 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 Benton County, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
77°F
Average low
42°F
Precipitation
1.75 in
Record high
95°FSep 3, 2017
Record low
34°FSep 29, 2019
Chance of a freeze
25%
Days of 90°F or more
2.0
Daylight
13 h 13 min to 11 h 45 min
Cloud cover
45%
Humidity
84%
Dew point
53°F
Wind
4.7 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 181°F44°F93°F 201739°F 200818%0%
Sep 281°F44°F94°F 201741°F 201218%0%
Sep 381°F44°F95°F 201741°F 200818%0%
Sep 480°F44°F93°F 202541°F 201519%0%
Sep 580°F44°F93°F 201439°F 201519%0%
Sep 680°F44°F95°F 201441°F 201020%0%
Sep 780°F44°F93°F 201242°F 201820%0%
Sep 880°F44°F89°F 202140°F 202221%0%
Sep 979°F43°F91°F 201143°F 201821%0%
Sep 1079°F43°F94°F 200739°F 200822%0%
Sep 1179°F43°F91°F 201542°F 202622%0%
Sep 1279°F43°F91°F 201741°F 201623%0%
Sep 1379°F43°F88°F 201242°F 200824%0%
Sep 1478°F43°F89°F 201440°F 201624%0%
Sep 1578°F43°F91°F 202340°F 201825%0%
Sep 1678°F42°F91°F 202542°F 202125%0%
Sep 1777°F42°F87°F 201242°F 202126%0%
Sep 1877°F42°F83°F 200940°F 201827%0%
Sep 1977°F42°F83°F 201438°F 201827%0%
Sep 2076°F42°F90°F 201440°F 200928%0%
Sep 2176°F42°F87°F 200939°F 201728%0%
Sep 2276°F41°F89°F 200940°F 200629%0%
Sep 2375°F41°F87°F 202537°F 200729%0%
Sep 2475°F41°F88°F 202536°F 200730%0%
Sep 2575°F41°F85°F 202239°F 200731%0%
Sep 2674°F41°F90°F 201639°F 200831%0%
Sep 2774°F40°F86°F 201740°F 201332%0%
Sep 2873°F40°F86°F 201738°F 201533%0%
Sep 2973°F40°F83°F 200634°F 201933%0%
Sep 3073°F40°F80°F 201036°F 201934%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Benton County, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

September 1
sunrise 6:37 AM, sunset 7:50 PM
September 30
sunrise 7:11 AM, sunset 6:56 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00351877 (Corvallis Water Bureau), public domain. Records: NOAA GHCN-Daily, station USW00004236, 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.