Winthrop, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a town in Okanogan County, Washington.
This Afternoon
53°F
Partly Sunny
Partly sunny. High near 53, with temperatures falling to around 48 in the afternoon. Wind around 0 mph.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 53°F | Partly Sunny | 0 mph | 2% |
| Tonight | 31°F | Partly Cloudy | 2 mph N | 2% |
| Wednesday | 55°F | Sunny | 0 to 6 mph SE | 2% |
| Wednesday Night | 35°F | Chance Rain Showers | 1 mph E | 45% |
| Thursday | 53°F | Mostly Sunny | 0 to 3 mph W | 6% |
| Thursday Night | 32°F | Mostly Cloudy then Chance Rain Showers | 0 to 3 mph NW | 36% |
| Friday | 52°F | Chance Rain Showers | 0 to 5 mph S | 36% |
| Friday Night | 33°F | Slight Chance Rain Showers | 0 to 3 mph SW | 21% |
| Saturday | 53°F | Mostly Cloudy | 0 to 5 mph SE | 12% |
| Saturday Night | 35°F | Rain Showers Likely | 2 mph SE | 62% |
| Sunday | 54°F | Rain Showers Likely | 0 to 5 mph W | 62% |
| Sunday Night | 30°F | Slight Chance Rain Showers then Mostly Cloudy | 2 mph NW | 18% |
| Monday | 50°F | Chance Rain Showers | 1 mph SE | 34% |
| Monday Night | 33°F | Chance Rain Showers | 1 mph E | 51% |
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 Nov 4, 2026.