Coulee Dam, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Coulee Dam, a town in Okanogan County, Washington.
Overnight
38°F
Partly Cloudy
Partly cloudy, with a low around 38. Wind around 0 mph.
7-day forecast for Coulee Dam
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 38°F | Partly Cloudy | 0 mph | 1% |
| Wednesday | 56°F | Sunny | 0 to 6 mph S | 2% |
| Wednesday Night | 40°F | Chance Rain Showers | 3 mph SE | 40% |
| Thursday | 55°F | Mostly Sunny | 3 mph S | 12% |
| Thursday Night | 39°F | Partly Cloudy | 5 mph SE | 9% |
| Friday | 55°F | Mostly Cloudy | 5 to 8 mph SE | 9% |
| Friday Night | 40°F | Mostly Cloudy | 5 mph SE | 9% |
| Saturday | 60°F | Partly Sunny | 6 mph E | 6% |
| Saturday Night | 42°F | Mostly Cloudy then Slight Chance Rain Showers | 7 mph SE | 15% |
| Sunday | 60°F | Slight Chance Rain Showers then Partly Sunny | 7 to 16 mph S | 15% |
| Sunday Night | 40°F | Mostly Cloudy | 2 to 8 mph S | 1% |
| Monday | 56°F | Partly Sunny then Slight Chance Rain Showers | 3 mph NE | 15% |
| Monday Night | 40°F | Chance Rain Showers | 5 mph E | 33% |
| Tuesday | 58°F | Chance Rain Showers | 3 to 7 mph SE | 33% |
Forecast source: National Weather Service (api.weather.gov) for Coulee Dam (47.969, -118.976). Updated through the day.
Growing snapshot for Coulee Dam
Last spring frost
Apr 22
First fall frost
Oct 21
Growing season
180 days
Hardiness zone
7b
More local growing data for Coulee Dam: nearby ZIP 99124 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Brewster
Conconully
Disautel
Elmer City
Loomis
Malott
Methow
Nespelem
North Omak
Okanogan
Omak
Oroville
Pateros
Riverside
Tonasket
Twisp
Winthrop
Climate data from the nearest NOAA station, Coulee Dam 1 Sw, Wa (3.9 mi from Coulee Dam). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.