Okanogan County climate

Okanogan County Weather in September

NOAA 1991-2020 normals for Omak AP, 19.2 km from Okanogan County

Average highs run from 84°F on September 1 to 71°F on September 30, and lows from 53°F to 44°F. Normal precipitation for the month is 0.40 in over about 4 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 Okanogan County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
48°F
Precipitation
0.40 in
Record high
104°FSep 3, 2025
Record low
22°FSep 23, 2000
Chance of a freeze
24%
Days of 90°F or more
3.3
Daylight
13 h 24 min to 11 h 43 min
Cloud cover
45%
Humidity
57%
Dew point
39°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 184°F53°F100°F 202436°F 200610%0%
Sep 284°F52°F101°F 202538°F 200610%0%
Sep 384°F52°F104°F 202539°F 201510%0%
Sep 483°F52°F102°F 202535°F 201111%0%
Sep 583°F52°F99°F 202041°F 201111%0%
Sep 683°F51°F96°F 199839°F 200011%0%
Sep 782°F51°F96°F 202437°F 199911%0%
Sep 882°F51°F96°F 201133°F 200211%0%
Sep 981°F50°F99°F 201133°F 200012%0%
Sep 1081°F50°F98°F 201139°F 200312%0%
Sep 1181°F50°F98°F 201133°F 201412%0%
Sep 1280°F50°F94°F 201131°F 201412%0%
Sep 1380°F49°F97°F 201334°F 201212%0%
Sep 1479°F49°F94°F 201341°F 201212%0%
Sep 1579°F49°F92°F 200141°F 201213%0%
Sep 1678°F48°F91°F 200135°F 201113%0%
Sep 1778°F48°F91°F 200832°F 200613%
Sep 1877°F48°F89°F 200839°F 200513%
Sep 1977°F48°F91°F 201237°F 201713%
Sep 2076°F47°F87°F 199936°F 200413%
Sep 2176°F47°F89°F 201433°F 200414%
Sep 2275°F47°F87°F 199930°F 200014%
Sep 2375°F46°F90°F 200922°F 200014%
Sep 2474°F46°F90°F 201126°F 200014%
Sep 2574°F46°F90°F 200330°F 200014%
Sep 2673°F45°F87°F 200331°F 200014%
Sep 2773°F45°F89°F 202231°F 200014%
Sep 2872°F44°F87°F 201024°F 199914%
Sep 2971°F44°F84°F 200328°F 200715%
Sep 3071°F44°F83°F 200334°F 201115%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Okanogan County, in percent, and of at least 0.1 inch of snowfall.0510151102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

September 1
sunrise 6:16 AM, sunset 7:40 PM
September 30
sunrise 6:57 AM, sunset 6:40 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094197 (Omak AP), public domain. Records: NOAA GHCN-Daily, station USW00094197, 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.