Winthrop, WA Weather & Growing Conditions
Today
71°F
Smoke
Smoke and haze before 3pm, then haze and areas of smoke. Sunny, with a high near 71. South wind 1 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Smoke | 1 to 6 mph S | 0% |
| Tonight | 51°F | Smoke | 2 to 6 mph N | 0% |
| Wednesday | 77°F | Smoke | 2 to 7 mph SW | 0% |
| Wednesday Night | 53°F | Smoke then Clear | 3 to 7 mph W | 0% |
| Thursday | 79°F | Sunny | 2 to 9 mph W | 0% |
| Thursday Night | 55°F | Mostly Clear | 5 to 9 mph W | 0% |
| Friday | 73°F | Sunny | 5 to 12 mph W | 0% |
| Friday Night | 51°F | Mostly Clear | 5 to 12 mph W | 0% |
| Saturday | 69°F | Sunny | 5 to 12 mph W | 0% |
| Saturday Night | 48°F | Mostly Clear | 7 to 12 mph W | 0% |
| Sunday | 67°F | Sunny | 7 to 10 mph W | 0% |
| Sunday Night | 47°F | Mostly Clear | 6 to 10 mph W | 0% |
| Monday | 65°F | Sunny | 5 to 9 mph W | 1% |
| Monday Night | 47°F | Mostly Clear | 6 to 9 mph W | 1% |
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 Aug 4, 2026.