Winthrop, WA Weather & Growing Conditions
This Afternoon
66°F
Mostly Sunny
Mostly sunny. High near 66, with temperatures falling to around 64 in the afternoon. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Mostly Sunny | 6 mph S | 1% |
| Tonight | 46°F | Mostly Clear | 3 mph S | 1% |
| Sunday | 68°F | Sunny | 1 to 5 mph S | 1% |
| Sunday Night | 47°F | Mostly Clear | 3 mph W | 0% |
| Monday | 65°F | Mostly Sunny | 2 to 8 mph W | 0% |
| Monday Night | 43°F | Partly Cloudy | 5 to 8 mph W | 0% |
| Tuesday | 59°F | Mostly Sunny | 5 to 9 mph W | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 5 to 9 mph W | 0% |
| Wednesday | 53°F | Mostly Sunny | 5 to 9 mph W | 3% |
| Wednesday Night | 37°F | Partly Cloudy | 3 to 9 mph W | 9% |
| Thursday | 51°F | Partly Sunny then Slight Chance Rain Showers | 6 mph S | 16% |
| Thursday Night | 39°F | Slight Chance Rain Showers | 6 mph NE | 21% |
| Friday | 49°F | Slight Chance Rain Showers | 3 to 8 mph NW | 18% |
| Friday Night | 36°F | Slight Chance Rain And Snow Showers | 5 to 8 mph NW | 18% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Winthrop, WA
Last spring frost
Apr 27
First fall frost
Oct 17
Growing season
173 days
Hardiness zone
6b
Explore more for Winthrop, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Stehekin 4 Nw, Wa (2.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.