Pullman weather in September: Pullman, Washington: normal highs, lows, rain and records for September
Pullman in September has a normal high of 74°F and a normal low of 45°F, a daily mean of 60°F, falling from 79°F on the 1st to 68°F by the 30th. Measurable precipitation falls on 5 days in a normal September, 0.65 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 7°C, 17 mm of precipitation in September.
- NOAA stationPullman Moscow Regional Airport
- Station IDUSW00094129
- Location46.74°N 117.11°W
- Elevation2,551 ft (778 m)
- Population33,543
- Jan 38° 28°
- Feb 42° 29°
- Mar 49° 33°
- Apr 56° 37°
- May 65° 44°
- Jun 72° 48°
- Jul 83° 51°
- Aug 83° 50°
- Sep 74° 45°
- Oct 59° 38°
- Nov 45° 33°
- Dec 37° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Pullman in September?
The normal high is 74°F and the normal low 45°F, for a daily mean of 59.8°F. September is 7.1°F cooler than August and 11.4°F warmer than October. September is the 3rd warmest month of the year in Pullman and the 10th wettest. Across the month the normal high falls 11°F, from 79°F on September 1 to 68°F on September 30. From one year to the next September's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 57°F and 62°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 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 48°F | 12% | 5% |
| September 8 | 77°F | 47°F | 13% | 6% |
| September 15 | 75°F | 46°F | 15% | 7% |
| September 22 | 72°F | 44°F | 18% | 9% |
| September 30 | 68°F | 42°F | 21% | 11% |
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 | 79°F | 48°F | 12% | 5% | 13 h 20 min |
| September 2 | 79°F | 48°F | 12% | 5% | 13 h 20 min |
| September 3 | 79°F | 48°F | 13% | 5% | 13 h 20 min |
| September 4 | 79°F | 48°F | 13% | 5% | 13 h 10 min |
| September 5 | 78°F | 48°F | 13% | 6% | 13 h 10 min |
| September 6 | 78°F | 48°F | 13% | 6% | 13 h 10 min |
| September 7 | 78°F | 47°F | 13% | 6% | 13 h |
| September 8 | 77°F | 47°F | 13% | 6% | 13 h |
| September 9 | 77°F | 47°F | 14% | 6% | 13 h |
| September 10 | 77°F | 47°F | 14% | 6% | 12 h 50 min |
| September 11 | 76°F | 47°F | 14% | 6% | 12 h 50 min |
| September 12 | 76°F | 46°F | 14% | 6% | 12 h 50 min |
| September 13 | 76°F | 46°F | 15% | 7% | 12 h 40 min |
| September 14 | 75°F | 46°F | 15% | 7% | 12 h 40 min |
| September 15 | 75°F | 46°F | 15% | 7% | 12 h 40 min |
| September 16 | 74°F | 46°F | 16% | 7% | 12 h 30 min |
| September 17 | 74°F | 45°F | 16% | 8% | 12 h 30 min |
| September 18 | 74°F | 45°F | 16% | 8% | 12 h 30 min |
| September 19 | 73°F | 45°F | 17% | 8% | 12 h 30 min |
| September 20 | 73°F | 45°F | 17% | 8% | 12 h 20 min |
| September 21 | 72°F | 44°F | 18% | 9% | 12 h 20 min |
| September 22 | 72°F | 44°F | 18% | 9% | 12 h 20 min |
| September 23 | 71°F | 44°F | 18% | 9% | 12 h 10 min |
| September 24 | 71°F | 43°F | 19% | 9% | 12 h 10 min |
| September 25 | 70°F | 43°F | 19% | 9% | 12 h 10 min |
| September 26 | 70°F | 43°F | 20% | 10% | 12 h |
| September 27 | 69°F | 43°F | 20% | 10% | 12 h |
| September 28 | 69°F | 42°F | 20% | 10% | 12 h |
| September 29 | 68°F | 42°F | 21% | 11% | 11 h 50 min |
| September 30 | 68°F | 42°F | 21% | 11% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 45°FSeptember average
- Precipitation
- 0.65 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 2
- 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
- 20
- Days at 80°F or more
- 9
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094129; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Pullman in September?
On a given September day the chance of 0.01 inch or more is 16% on average, highest around September 30 (21%). In all, 0.65 in falls on 5 days of a normal September.
In a normal September in Pullman, 2 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094129.
What are the records for September in Pullman?
The warmest September temperature on Pullman's official record (since 1893) is 100°F, on September 4, 1988; the coldest is 20°F, on September 29, 1983. The wettest September brought 4.42 in (1927).
The September mean against the 1991-2020 normal of 59.8°F: 2021 60.1°F (+0.3), 2022 62.0°F (+2.2), 2023 60.0°F (+0.3), 2024 62.6°F (+2.8), 2025 66.6°F (+6.8), 2026 58.1°F (−1.7). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 60.1°F | +0.3°F | 0.84 in |
| 2022 | 62.0°F | +2.2°F | 1.77 in |
| 2023 | 60.0°F | +0.3°F | 1.01 in |
| 2024 | 62.6°F | +2.8°F | 1.36 in |
| 2025 | 66.6°F | +6.8°F | 0.82 in |
| 2026 | 58.1°F | −1.7°F | 1.93 in |
Source: records: ACIS, NWS threaded record PUWthr; recent months: ACIS, station USW00094129. Records and recent months use complete months only.
How does September in Pullman 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; Pullman's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.