Winthrop, WA Weather & Growing Conditions
Today
69°F
Mostly Sunny
Mostly sunny, with a high near 69. Southeast wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 69°F | Mostly Sunny | 1 to 5 mph SE | 1% |
| Tonight | 51°F | Mostly Clear | 5 mph NW | 1% |
| Sunday | 69°F | Sunny | 5 mph SW | 0% |
| Sunday Night | 50°F | Mostly Clear | 5 mph N | 0% |
| Monday | 69°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Monday Night | 48°F | Partly Cloudy | 3 to 8 mph NW | 0% |
| Tuesday | 66°F | Mostly Sunny | 1 to 6 mph SW | 0% |
| Tuesday Night | 46°F | Mostly Cloudy | 5 to 8 mph W | 0% |
| Wednesday | 61°F | Partly Sunny | 1 to 6 mph W | 1% |
| Wednesday Night | 46°F | Mostly Cloudy | 6 mph NW | 2% |
| Thursday | 59°F | Partly Sunny then Slight Chance Rain Showers | 3 mph SW | 16% |
| Thursday Night | 46°F | Slight Chance Rain Showers | 2 to 6 mph NW | 19% |
| Friday | 56°F | Slight Chance Rain Showers | 5 mph NW | 17% |
| Friday Night | 43°F | Slight Chance Rain Showers then Partly Cloudy | 6 mph NW | 17% |
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.