Roslyn, WA Weather & Growing Conditions
Tonight
46°F
Mostly Clear
Mostly clear. Low around 46, with temperatures rising to around 48 overnight. West wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Mostly Clear | 1 to 5 mph W | 0% |
| Saturday | 78°F | Mostly Sunny | 2 mph W | 0% |
| Saturday Night | 48°F | Mostly Clear | 1 mph NW | 0% |
| Sunday | 80°F | Sunny | 0 to 3 mph SE | 0% |
| Sunday Night | 49°F | Mostly Clear | 2 mph E | 0% |
| Monday | 75°F | Sunny | 0 to 6 mph NW | 0% |
| Monday Night | 46°F | Partly Cloudy | 6 mph W | 0% |
| Tuesday | 69°F | Mostly Sunny | 3 to 7 mph W | 0% |
| Tuesday Night | 43°F | Partly Cloudy | 3 to 7 mph W | 1% |
| Wednesday | 68°F | Mostly Sunny | 3 mph W | 1% |
| Wednesday Night | 45°F | Partly Cloudy | 0 to 3 mph NW | 2% |
| Thursday | 70°F | Mostly Sunny | 0 to 3 mph NE | 11% |
| Thursday Night | 46°F | Mostly Cloudy | 0 to 3 mph W | 13% |
| Friday | 64°F | Mostly Sunny | 1 to 6 mph W | 13% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Roslyn, WA
Last spring frost
May 13
First fall frost
Sep 25
Growing season
132 days
Hardiness zone
7a
Explore more for Roslyn, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Cle Elum, Wa (4.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.