Winthrop, WA Weather & Growing Conditions
Tonight
51°F
Partly Cloudy
Partly cloudy. Low around 51, with temperatures rising to around 53 overnight. North wind 3 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Partly Cloudy | 3 to 7 mph N | 1% |
| Saturday | 69°F | Mostly Sunny | 1 to 5 mph NE | 0% |
| Saturday Night | 52°F | Partly Cloudy | 5 mph N | 0% |
| Sunday | 69°F | Sunny | 5 mph W | 0% |
| Sunday Night | 51°F | Mostly Clear | 5 mph NW | 0% |
| Monday | 69°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 48°F | Partly Cloudy | 5 to 9 mph NW | 0% |
| Tuesday | 65°F | Mostly Sunny | 1 to 6 mph SW | 1% |
| Tuesday Night | 45°F | Partly Cloudy | 5 to 8 mph W | 0% |
| Wednesday | 61°F | Mostly Sunny | 1 to 6 mph SW | 3% |
| Wednesday Night | 47°F | Mostly Cloudy | 1 to 5 mph NW | 5% |
| Thursday | 61°F | Partly Sunny | 0 to 5 mph N | 12% |
| Thursday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph NW | 16% |
| Friday | 59°F | Slight Chance Rain Showers then Mostly Sunny | 2 to 6 mph W | 16% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Winthrop, WA
Last spring frost
May 15
First fall frost
Sep 22
Growing season
127 days
Hardiness zone
6b
Explore more for Winthrop, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Winthrop 1 Wsw, Wa (8.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.