Union, WA Weather & Growing Conditions
Tonight
50°F
Partly Cloudy
Partly cloudy, with a low around 50. West northwest wind 0 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Partly Cloudy | 0 to 6 mph WNW | 0% |
| Saturday | 72°F | Partly Sunny | 0 to 3 mph SW | 1% |
| Saturday Night | 50°F | Partly Cloudy | 0 to 3 mph NW | 0% |
| Sunday | 73°F | Mostly Sunny | 0 to 3 mph ESE | 0% |
| Sunday Night | 49°F | Mostly Clear | 0 to 3 mph NE | 0% |
| Monday | 71°F | Mostly Sunny | 0 to 5 mph SW | 1% |
| Monday Night | 49°F | Partly Cloudy | 0 to 5 mph WNW | 1% |
| Tuesday | 68°F | Partly Sunny | 0 to 6 mph WSW | 1% |
| Tuesday Night | 47°F | Partly Cloudy | 0 to 6 mph W | 2% |
| Wednesday | 67°F | Partly Sunny | 0 to 5 mph SSE | 4% |
| Wednesday Night | 49°F | Mostly Cloudy | 0 to 5 mph NW | 8% |
| Thursday | 68°F | Partly Sunny then Slight Chance Light Rain | 0 to 5 mph ESE | 15% |
| Thursday Night | 50°F | Chance Light Rain | 5 mph WSW | 29% |
| Friday | 65°F | Chance Light Rain | 3 to 7 mph WSW | 29% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Union, WA
Last spring frost
Mar 24
First fall frost
Nov 15
Growing season
235 days
Hardiness zone
8b
Explore more for Union, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Cushman Powerhouse #2, Wa (4.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.