Winthrop, WA Weather & Growing Conditions
This Afternoon
44°F
Chance Rain Showers
A chance of rain showers after 4pm. Partly sunny. High near 44, with temperatures falling to around 38 in the afternoon. South wind around 3 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 44°F | Chance Rain Showers | 3 mph S | 47% |
| Tonight | 32°F | Rain And Snow Showers | 5 mph SW | 88% |
| Thursday | 36°F | Slight Chance Snow Showers then Partly Sunny | 2 to 7 mph W | 17% |
| Thursday Night | 28°F | Mostly Cloudy then Chance Snow Showers | 2 mph SW | 34% |
| Friday | 37°F | Snow Showers | 3 mph SW | 91% |
| Friday Night | 36°F | Rain Showers Likely | 5 mph SW | 57% |
| Saturday | 40°F | Slight Chance Rain Showers | 6 mph SE | 19% |
| Saturday Night | 35°F | Rain And Snow Showers | 8 mph SE | 90% |
| Sunday | 37°F | Rain And Snow Showers | 3 to 8 mph SW | 90% |
| Sunday Night | 29°F | Slight Chance Snow Showers then Mostly Cloudy | 3 mph NW | 17% |
| Monday | 37°F | Mostly Sunny then Slight Chance Snow Showers | 3 mph W | 15% |
| Monday Night | 32°F | Snow Showers Likely | 3 mph W | 59% |
| Tuesday | 38°F | Snow Showers Likely | 5 mph SW | 62% |
| Tuesday Night | 34°F | Rain And Snow Showers Likely | 5 mph S | 62% |
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 Nov 5, 2026.