Washington weather in September: Statewide normals and every place, NOAA 1991-2020
In September, Washington's statewide normal high is 71°F and normal low 46°F; normal highs run from 66°F in Coupeville to 81°F in Pasco (NOAA 1991-2020 normals).
- Statewide normal high
- 71°FSeptember, 1991-2020
- Statewide normal low
- 46°FSeptember, 1991-2020
- Statewide normal precipitation
- 1.72 inSeptember
- Warmest place
- 81°Fnormal high, Pasco
- Coolest place
- 66°Fnormal high, Coupeville
Where is Washington warmest and wettest in September?
Pasco has the warmest September afternoons (81°F) and Coupeville the coolest (66°F). Baring gets the most precipitation (4.79 in) and Quincy the least (0.20 in).
Statewide, September averaged 58.0°F in 2021, 61.7°F in 2022, 58.3°F in 2023, 61.7°F in 2024, 63.6°F in 2025, against a 1991-2020 normal of 58.4°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Seattle | 72°F | 54°F | 1.61 | 0.0 |
| Spokane | 74°F | 49°F | 0.58 | 0.1 |
| Tacoma | 70°F | 51°F | 1.54 | – |
| Vancouver | 76°F | 52°F | 1.43 | – |
| Kent | 73°F | 52°F | 1.49 | – |
| Everett | 68°F | 52°F | 1.68 | – |
| Renton | 72°F | 53°F | 1.53 | – |
| Yakima | 79°F | 45°F | 0.23 | 0.0 |
| Bellingham | 68°F | 50°F | 2.01 | – |
| Kennewick | 81°F | 53°F | 0.26 | – |
| Pasco | 81°F | 48°F | 0.31 | – |
| Richland | 79°F | 51°F | 0.29 | – |
| Olympia | 72°F | 46°F | 2.04 | 0.0 |
| Bremerton | 72°F | 51°F | 1.80 | 0.0 |
| Longview | 76°F | 50°F | 2.29 | – |
| Wenatchee | 77°F | 53°F | 0.23 | – |
| Mount Vernon | 69°F | 49°F | – | – |
| Walla Walla | 79°F | 54°F | 0.64 | 0.0 |
| Pullman | 74°F | 45°F | 0.65 | – |
| Moses Lake | 79°F | 47°F | 0.26 | – |
| Hazel Dell | 74°F | 47°F | 1.61 | 0.0 |
| Battle Ground | 75°F | 46°F | 2.20 | 0.0 |
| Arlington | 72°F | 42°F | 2.49 | 0.0 |
| Ellensburg | 78°F | 47°F | 0.37 | – |
| Port Angeles | 66°F | 47°F | 1.29 | – |
| Monroe | 69°F | 48°F | 2.73 | 0.0 |
| Centralia | 73°F | 48°F | 1.59 | – |
| Anacortes | 70°F | 51°F | 1.55 | – |
| Aberdeen | 69°F | 51°F | 2.73 | 0.0 |
| Sunnyside | 78°F | 45°F | 0.36 | – |
| Snoqualmie | 70°F | 49°F | 3.02 | 0.0 |
| Sedro-Woolley | 70°F | 49°F | 2.86 | 0.0 |
| Shelton | 74°F | 48°F | 2.50 | – |
| Port Townsend | 68°F | 51°F | 1.10 | 0.0 |
| Hoquiam | 67°F | 51°F | 2.53 | – |
| Ephrata | 79°F | 51°F | 0.22 | – |
| Selah | 78°F | 44°F | 0.28 | – |
| Quincy | 78°F | 50°F | 0.20 | – |
| Sequim | 66°F | 46°F | 0.87 | 0.0 |
| Prosser | 80°F | 50°F | 0.27 | – |
| Blaine | 67°F | 50°F | 2.22 | 0.0 |
| Buckley | 72°F | 47°F | 2.35 | 0.0 |
| Deer Park | 74°F | 40°F | 0.82 | – |
| Omak | 78°F | 48°F | 0.40 | – |
| Connell | 79°F | 47°F | 0.30 | – |
| Colville | 78°F | 44°F | 0.72 | 0.0 |
| Wapato | 80°F | 49°F | 0.23 | 0.0 |
| Chelan | 77°F | 49°F | 0.34 | 0.0 |
| Goldendale | 77°F | 42°F | 0.44 | 0.0 |
| Elma | 75°F | 48°F | 2.67 | – |
| Forks | 70°F | 47°F | 4.77 | 0.0 |
| Raymond | 70°F | 46°F | 3.11 | 0.0 |
| Leavenworth | 78°F | 42°F | 0.76 | 0.0 |
| Friday Harbor | 68°F | 48°F | 1.04 | – |
| Chewelah | 76°F | 39°F | 0.95 | – |
| Carson | 74°F | 44°F | 2.81 | 0.0 |
| Dayton | 77°F | 47°F | 0.73 | 0.0 |
| Cle Elum | 73°F | 43°F | 0.90 | – |
| Newport | 73°F | 41°F | 1.16 | – |
| Coupeville | 66°F | 49°F | 1.22 | 0.0 |
| Davenport | 73°F | 40°F | 0.49 | 0.0 |
| Long Beach | 66°F | 48°F | 2.66 | 0.0 |
| Ritzville | 77°F | 46°F | 0.43 | 0.0 |
| Entiat | 79°F | 49°F | 0.40 | 0.0 |
| Darrington | 72°F | 47°F | 3.39 | – |
| Pomeroy | 75°F | 45°F | 0.58 | 0.0 |
| McMillin | 70°F | 48°F | 1.78 | 0.0 |
| Coulee Dam | 77°F | 51°F | 0.36 | – |
| Waterville | 74°F | 45°F | 0.26 | – |
| Tonasket | 77°F | 46°F | – | – |
| Easton | 69°F | 43°F | 1.88 | – |
| Republic | 74°F | 38°F | 0.87 | 0.0 |
| Wilbur | 75°F | 42°F | 0.45 | – |
| Odessa | 78°F | 43°F | 0.34 | 0.0 |
| Concrete | 71°F | 50°F | 3.31 | 0.0 |
| Toledo | 75°F | 47°F | – | – |
| Startup | 73°F | 47°F | 3.49 | – |
| Grayland | 67°F | 49°F | 2.94 | 0.0 |
| Winthrop | 77°F | 41°F | 0.45 | 0.0 |
| St. John | 74°F | 47°F | 0.56 | 0.0 |
| Rosalia | 76°F | 44°F | 0.62 | 0.0 |
| Lind | 79°F | 47°F | 0.34 | 0.0 |
| Naselle | 72°F | 46°F | 4.27 | 0.0 |
| Quilcene | 72°F | 47°F | – | – |
| Harrington | 76°F | 42°F | 0.43 | 0.0 |
| Northport | 75°F | 43°F | 0.97 | 0.0 |
| LaCrosse | 79°F | 44°F | 0.50 | 0.0 |
| Glenwood | 77°F | 36°F | 0.91 | 0.0 |
| Humptulips | 67°F | 46°F | 4.56 | 0.0 |
| Baring | 71°F | 48°F | 4.79 | 0.0 |
| Hartline | 76°F | 48°F | 0.34 | – |
| Hatton | 79°F | 50°F | 0.39 | 0.0 |
| Packwood | 74°F | 47°F | 2.31 | 0.0 |
| Bickleton | 71°F | 47°F | 0.44 | 0.0 |
| Methow | 79°F | 48°F | – | – |
| Cougar | 75°F | 51°F | 4.26 | 0.0 |
| Boundary Dam | 73°F | 43°F | 1.32 | 0.0 |
| Cedar Lake | 64°F | 47°F | 4.78 | 0.0 |
| Chief Joseph Dam | 80°F | 49°F | 0.35 | 0.0 |
| Clearbrook | 71°F | 47°F | 2.93 | 0.0 |
| Clearwater | 70°F | 46°F | 4.80 | – |
| Cushman Powerhouse #2 | 69°F | 50°F | 3.02 | 0.0 |
| Diablo Dam | 71°F | 49°F | 3.41 | 0.0 |
| Eltopia (8 mi WSW) | 77°F | 49°F | 0.39 | – |
| Elwha Ranger Station | 68°F | 48°F | 1.63 | 0.0 |
| Glenoma | 73°F | 44°F | – | – |
| Grays River Hatchery | 74°F | 46°F | 4.40 | 0.0 |
| Holden Village | 67°F | 40°F | 1.67 | 0.0 |
| Ice Harbor Dam | 80°F | 51°F | 0.39 | 0.0 |
| Landsburg | 71°F | 47°F | 2.83 | – |
| Longmire Rainier NPS | 69°F | 42°F | 3.50 | 0.0 |
| Matlock (8 mi S) | 72°F | 47°F | 3.25 | 0.0 |
| Mayfield Power Plant | 74°F | 48°F | 2.46 | 0.0 |
| Mazama | 74°F | 45°F | 0.76 | 0.0 |
| McNary Dam | 78°F | 54°F | 0.28 | – |
| Mount Adams Ranger Station | 75°F | 42°F | – | – |
| Moxee City (10 mi E) | 77°F | 47°F | 0.29 | 0.0 |
| Mud Mountain Dam | 70°F | 48°F | 3.37 | – |
| Newhalem | 71°F | 50°F | 3.55 | 0.0 |
| Olga (2 mi SE) | 65°F | 51°F | 1.62 | 0.0 |
| Palmer (3 mi ESE) | 70°F | 50°F | 3.99 | 0.0 |
| Plain | 74°F | 42°F | 0.79 | 0.0 |
| Priest Rapids Dam | 80°F | 58°F | 0.15 | – |
| Quillayute State Airport | 67°F | 48°F | 4.56 | – |
| Quinault (4 mi NE) | 69°F | 49°F | 6.13 | – |
| Rainier Paradise Ranger Station | 57°F | 41°F | 4.43 | – |
| Ross Dam | 70°F | 50°F | 2.50 | 0.0 |
| Sagemoor | 80°F | 47°F | 0.34 | – |
| Satus Pass (2 mi SSW) | 75°F | 43°F | 0.47 | – |
| Seattle Boeing Field | 72°F | 54°F | 1.37 | – |
| Seattle Sand Point Weather Office | 71°F | 53°F | 1.74 | 0.0 |
| Skamania Fish Hatchery | 74°F | 46°F | 3.19 | 0.0 |
| Smyrna | 82°F | 49°F | – | – |
| Snowden | 72°F | 45°F | – | – |
| Stampede Pass | 63°F | 47°F | 3.95 | – |
| Stehekin (4 mi NW) | 73°F | 48°F | 1.05 | 0.0 |
| Tacoma #1 | 71°F | 53°F | 1.57 | – |
| The Dalles Municipal Airport | 80°F | 52°F | 0.33 | – |
| Tolt S Fork Reservoir | 66°F | 50°F | 5.58 | 0.0 |
| Upper Baker Dam | 69°F | 47°F | 4.83 | 0.0 |
| Whidbey Island Naval Air Station | 67°F | 50°F | 1.08 | 0.0 |
| Whitman Mission | 80°F | 44°F | 0.68 | – |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.