Winthrop, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a town in Okanogan County, Washington.
Today
89°F
Haze
Haze and areas of smoke before 1pm, then smoke and haze between 1pm and 4pm, then haze and areas of smoke. Sunny, with a high near 89. Southeast wind 0 to 7 mph.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Haze | 0 to 7 mph SE | 1% |
| Tonight | 56°F | Smoke | 1 to 6 mph NW | 1% |
| Wednesday | 94°F | Smoke | 0 to 8 mph S | 0% |
| Wednesday Night | 58°F | Smoke then Mostly Clear | 1 to 8 mph W | 0% |
| Thursday | 98°F | Sunny | 1 to 9 mph SW | 0% |
| Thursday Night | 60°F | Mostly Clear | 3 to 9 mph W | 0% |
| Friday | 96°F | Sunny | 3 to 14 mph NW | 0% |
| Friday Night | 59°F | Mostly Clear | 5 to 14 mph NW | 0% |
| Saturday | 92°F | Sunny | 3 to 12 mph NW | 0% |
| Saturday Night | 57°F | Mostly Clear | 5 to 12 mph NW | 0% |
| Sunday | 90°F | Sunny | 2 to 9 mph NW | 1% |
| Sunday Night | 55°F | Mostly Clear | 3 to 9 mph NW | 1% |
| Monday | 89°F | Sunny | 1 to 7 mph W | 1% |
| Monday Night | 55°F | Mostly Clear | 3 to 7 mph W | 1% |
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 Aug 4, 2026.