Monroe climate

Monroe Weather in September

NOAA 1991-2020 normals for Corvallis 10 Ssw, 11.9 km from Monroe

Average highs run from 81°F on September 1 to 71°F on September 30, and lows from 50°F to 45°F. Normal precipitation for the month is 1.29 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 Monroe, 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
47°F
Precipitation
1.29 in
Record high
95°FSep 3, 2017
Record low
34°FSep 29, 2019
Chance of a freeze
1%
Days of 90°F or more
1.7
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°F50°F93°F 201739°F 200813%0%
Sep 280°F50°F94°F 201741°F 201214%0%
Sep 380°F50°F95°F 201741°F 200815%0%
Sep 480°F49°F93°F 202541°F 201515%0%
Sep 580°F49°F93°F 201439°F 201516%0%
Sep 680°F49°F95°F 201441°F 201016%0%
Sep 779°F49°F93°F 201242°F 201817%0%
Sep 879°F49°F89°F 202140°F 202217%0%
Sep 979°F49°F91°F 201143°F 201818%0%
Sep 1079°F49°F94°F 200739°F 200819%0%
Sep 1179°F48°F91°F 201542°F 202619%0%
Sep 1278°F48°F91°F 201741°F 201620%0%
Sep 1378°F48°F88°F 201242°F 200821%0%
Sep 1478°F48°F89°F 201440°F 201621%0%
Sep 1577°F48°F91°F 202340°F 201822%0%
Sep 1677°F48°F91°F 202542°F 202123%0%
Sep 1777°F47°F87°F 201242°F 202124%0%
Sep 1876°F47°F83°F 200940°F 201824%0%
Sep 1976°F47°F83°F 201438°F 201825%0%
Sep 2076°F47°F90°F 201440°F 200926%0%
Sep 2175°F46°F87°F 200939°F 201726%0%
Sep 2275°F46°F89°F 200940°F 200627%0%
Sep 2374°F46°F87°F 202537°F 200727%0%
Sep 2474°F46°F88°F 202536°F 200728%0%
Sep 2574°F46°F85°F 202239°F 200729%0%
Sep 2673°F45°F90°F 201639°F 200829%0%
Sep 2773°F45°F86°F 201740°F 201330%0%
Sep 2872°F45°F86°F 201738°F 201530%0%
Sep 2972°F45°F83°F 200634°F 201931%0%
Sep 3071°F45°F80°F 201036°F 201931%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Monroe, 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 6:36 AM, sunset 7:49 PM
September 30
sunrise 7:10 AM, sunset 6:55 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00004236 (Corvallis 10 Ssw), 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.