Ellensburg weather in September: Ellensburg, Washington: normal highs, lows, rain and records for September
Ellensburg in September has a normal high of 78°F and a normal low of 47°F, a daily mean of 62°F, falling from 83°F on the 1st to 71°F by the 30th. Measurable precipitation falls on 3 days in a normal September, 0.37 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 8°C, 9 mm of precipitation in September.
- NOAA stationEllensburg Bowers Field
- Station IDUSW00024220
- Location47.03°N 120.53°W
- Elevation1,766 ft (538 m)
- Population20,996
- Jan 37° 24°
- Feb 44° 27°
- Mar 53° 31°
- Apr 61° 37°
- May 71° 45°
- Jun 77° 51°
- Jul 86° 57°
- Aug 87° 56°
- Sep 78° 47°
- Oct 62° 37°
- Nov 47° 29°
- Dec 36° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Ellensburg in September?
The normal high is 78°F and the normal low 47°F, for a daily mean of 62.2°F. September is 9.0°F cooler than August and 12.6°F warmer than October. September is the 4th warmest month of the year in Ellensburg and the 10th wettest. Across the month the normal high falls 12°F, from 83°F on September 1 to 71°F on September 30. From one year to the next September's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 60°F and 64°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 16%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 83°F | 52°F | 8% | 3% |
| September 8 | 81°F | 49°F | 9% | 3% |
| September 15 | 78°F | 47°F | 11% | 3% |
| September 22 | 75°F | 45°F | 13% | 4% |
| September 30 | 71°F | 42°F | 16% | 5% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 83°F | 52°F | 8% | 3% | 13 h 20 min |
| September 2 | 83°F | 51°F | 9% | 3% | 13 h 20 min |
| September 3 | 82°F | 51°F | 9% | 3% | 13 h 20 min |
| September 4 | 82°F | 51°F | 9% | 3% | 13 h 10 min |
| September 5 | 82°F | 50°F | 9% | 3% | 13 h 10 min |
| September 6 | 81°F | 50°F | 9% | 3% | 13 h 10 min |
| September 7 | 81°F | 50°F | 9% | 3% | 13 h 10 min |
| September 8 | 81°F | 49°F | 9% | 3% | 13 h |
| September 9 | 80°F | 49°F | 10% | 3% | 13 h |
| September 10 | 80°F | 49°F | 10% | 3% | 13 h |
| September 11 | 80°F | 48°F | 10% | 3% | 12 h 50 min |
| September 12 | 79°F | 48°F | 10% | 3% | 12 h 50 min |
| September 13 | 79°F | 48°F | 11% | 3% | 12 h 50 min |
| September 14 | 78°F | 47°F | 11% | 3% | 12 h 40 min |
| September 15 | 78°F | 47°F | 11% | 3% | 12 h 40 min |
| September 16 | 78°F | 47°F | 11% | 3% | 12 h 40 min |
| September 17 | 77°F | 46°F | 12% | 3% | 12 h 30 min |
| September 18 | 77°F | 46°F | 12% | 4% | 12 h 30 min |
| September 19 | 76°F | 46°F | 12% | 4% | 12 h 30 min |
| September 20 | 76°F | 46°F | 12% | 4% | 12 h 20 min |
| September 21 | 76°F | 45°F | 13% | 4% | 12 h 20 min |
| September 22 | 75°F | 45°F | 13% | 4% | 12 h 20 min |
| September 23 | 75°F | 45°F | 13% | 4% | 12 h 10 min |
| September 24 | 74°F | 44°F | 14% | 4% | 12 h 10 min |
| September 25 | 74°F | 44°F | 14% | 4% | 12 h 10 min |
| September 26 | 73°F | 44°F | 15% | 4% | 12 h |
| September 27 | 73°F | 43°F | 15% | 4% | 12 h |
| September 28 | 72°F | 43°F | 15% | 4% | 12 h |
| September 29 | 72°F | 43°F | 16% | 5% | 11 h 50 min |
| September 30 | 71°F | 42°F | 16% | 5% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 47°FSeptember average
- Precipitation
- 0.37 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 3
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 24
- Days at 80°F or more
- 12
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024220; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Ellensburg in September?
On a given September day the chance of 0.01 inch or more is 12% on average, highest around September 30 (16%). In all, 0.37 in falls on 3 days of a normal September.
In a normal September in Ellensburg, 3 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024220.
What are the records for September in Ellensburg?
The warmest September temperature on this station's record (since 1940) is 99°F, on September 4, 2006; the coldest is 26°F, on September 23, 2000. The wettest September brought 2.31 in (2026).
The September mean against the 1991-2020 normal of 62.2°F: 2021 61.3°F (−0.9), 2022 65.5°F (+3.3), 2023 62.7°F (+0.5), 2024 66.7°F (+4.5), 2025 65.8°F (+3.6), 2026 57.8°F (−4.4). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 61.3°F | −0.9°F | 0.35 in |
| 2022 | 65.5°F | +3.3°F | 0.15 in |
| 2023 | 62.7°F | +0.5°F | 0.48 in |
| 2024 | 66.7°F | +4.5°F | 0.08 in |
| 2025 | 65.8°F | +3.6°F | 0.31 in |
| 2026 | 57.8°F | −4.4°F | 2.31 in |
Source: records: ACIS, station USW00024220; recent months: ACIS, station USW00024220. Records and recent months use complete months only.
How does September in Ellensburg compare across Washington?
Across the 96 places PlainClimate covers in Washington, September normal highs run from 66°F in Coupeville to 81°F in Pasco; Ellensburg's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Ellensburg in August87°F by day, 56°F at night
- Ellensburg in October62°F by day, 37°F at night
- Ellensburg through the yearEvery month, frost dates, records and recent years
- Washington in SeptemberThe statewide normal and the warmest and coolest places
- Pasco: Washington's warmest Septembernormal high 81°F