Ellensburg Weather in September
Average highs run from 81°F on September 1 to 70°F on September 30, and lows from 48°F to 39°F. Normal precipitation for the month is 0.33 in over about 3 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 76°F
- Average low
- 43°F
- Precipitation
- 0.33 in
- Record high
- 99°FSep 1, 2024
- Record low
- 26°FSep 23, 2000
- Chance of a freeze
- 44%
- Days of 90°F or more
- 2.1
- Daylight
- 13 h 19 min to 11 h 43 min
- Cloud cover
- 48%
- Humidity
- 60%
- Dew point
- 42°F
- Wind
- 5.4 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 81°F | 48°F | 99°F 2024 | 35°F 1999 | 9% |
| Sep 2 | 80°F | 48°F | 98°F 2017 | 37°F 1999 | 9% |
| Sep 3 | 80°F | 47°F | 99°F 2025 | 34°F 1958 | 9% |
| Sep 4 | 80°F | 47°F | 99°F 2006 | 37°F 2002 | 9% |
| Sep 5 | 80°F | 47°F | 97°F 2006 | 36°F 1956 | 9% |
| Sep 6 | 79°F | 46°F | 98°F 2024 | 36°F 2002 | 9% |
| Sep 7 | 79°F | 46°F | 95°F 1944 | 37°F 1999 | 9% |
| Sep 8 | 79°F | 46°F | 93°F 2011 | 34°F 1999 | 10% |
| Sep 9 | 79°F | 46°F | 98°F 2011 | 33°F 1959 | 10% |
| Sep 10 | 78°F | 45°F | 98°F 2011 | 37°F 1959 | 10% |
| Sep 11 | 78°F | 45°F | 99°F 2011 | 35°F 1941 | 10% |
| Sep 12 | 78°F | 45°F | 98°F 2013 | 33°F 2014 | 10% |
| Sep 13 | 77°F | 44°F | 96°F 2009 | 35°F 1949 | 10% |
| Sep 14 | 77°F | 44°F | 96°F 2013 | 33°F 1952 | 11% |
| Sep 15 | 77°F | 44°F | 95°F 2013 | 35°F 1952 | 11% |
| Sep 16 | 76°F | 43°F | 91°F 2008 | 33°F 2015 | 11% |
| Sep 17 | 76°F | 43°F | 92°F 2008 | 36°F 2018 | 11% |
| Sep 18 | 76°F | 43°F | 92°F 1952 | 30°F 1944 | 11% |
| Sep 19 | 75°F | 42°F | 95°F 2012 | 31°F 1941 | 12% |
| Sep 20 | 75°F | 42°F | 90°F 2012 | 31°F 1941 | 12% |
| Sep 21 | 74°F | 42°F | 91°F 2014 | 32°F 1941 | 12% |
| Sep 22 | 74°F | 41°F | 87°F 1950 | 30°F 2000 | 12% |
| Sep 23 | 74°F | 41°F | 93°F 2009 | 26°F 2000 | 13% |
| Sep 24 | 73°F | 41°F | 92°F 2011 | 29°F 1958 | 13% |
| Sep 25 | 73°F | 40°F | 91°F 1952 | 27°F 2000 | 13% |
| Sep 26 | 72°F | 40°F | 86°F 1942 | 29°F 2000 | 14% |
| Sep 27 | 72°F | 40°F | 88°F 2003 | 30°F 1945 | 14% |
| Sep 28 | 71°F | 39°F | 89°F 2006 | 27°F 1999 | 14% |
| Sep 29 | 71°F | 39°F | 85°F 2006 | 32°F 1945 | 15% |
| Sep 30 | 70°F | 39°F | 84°F 2008 | 30°F 1948 | 15% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:22 AM, sunset 7:41 PM
- September 30
- sunrise 7:00 AM, sunset 6:43 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00452505 (Ellensburg), public domain. Records: NOAA GHCN-Daily, station USW00024220, 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.