Winthrop, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a town in Okanogan County, Washington.
Tonight
49°F
Partly Cloudy
Partly cloudy. Low around 49, with temperatures rising to around 51 overnight. Northwest wind 0 to 3 mph.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Partly Cloudy | 0 to 3 mph NW | 1% |
| Saturday | 81°F | Mostly Sunny | 0 to 7 mph SE | 0% |
| Saturday Night | 48°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Sunday | 82°F | Sunny | 0 to 7 mph E | 0% |
| Sunday Night | 48°F | Mostly Clear | 0 to 7 mph N | 0% |
| Monday | 82°F | Sunny | 1 to 6 mph SW | 0% |
| Monday Night | 46°F | Partly Cloudy | 2 to 6 mph NW | 0% |
| Tuesday | 77°F | Mostly Sunny | 0 to 6 mph SW | 0% |
| Tuesday Night | 43°F | Partly Cloudy | 2 to 6 mph W | 0% |
| Wednesday | 72°F | Mostly Sunny | 0 to 6 mph E | 1% |
| Wednesday Night | 45°F | Mostly Cloudy | 0 to 6 mph N | 5% |
| Thursday | 72°F | Partly Sunny | 0 to 6 mph SE | 11% |
| Thursday Night | 47°F | Mostly Cloudy | 0 to 6 mph N | 13% |
| Friday | 69°F | Partly Sunny | 0 to 8 mph W | 13% |
Forecast source: National Weather Service (api.weather.gov) for Winthrop (48.472, -120.179). Updated through the day.
Growing snapshot for Winthrop
Last spring frost
May 15
First fall frost
Sep 22
Growing season
127 days
Hardiness zone
6b
More local growing data for Winthrop: nearby ZIP 98862 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Brewster
Conconully
Coulee Dam
Disautel
Elmer City
Loomis
Malott
Methow
Nespelem
North Omak
Okanogan
Omak
Oroville
Pateros
Riverside
Tonasket
Twisp
Climate data from the nearest NOAA station, Winthrop 1 Wsw, Wa (8.7 mi from Winthrop). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.