Union, WA Weather & Growing Conditions
Today
87°F
Sunny then Areas Of Smoke
Areas of smoke after 2pm. Sunny, with a high near 87. East northeast wind 1 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny then Areas Of Smoke | 1 to 7 mph ENE | 0% |
| Tonight | 57°F | Areas Of Smoke | 0 to 6 mph NE | 0% |
| Wednesday | 91°F | Areas Of Smoke | 0 to 5 mph ENE | 0% |
| Wednesday Night | 59°F | Clear | 1 to 5 mph NNW | 0% |
| Thursday | 88°F | Sunny | 0 to 7 mph SW | 0% |
| Thursday Night | 57°F | Mostly Clear | 3 to 7 mph SW | 0% |
| Friday | 84°F | Sunny | 3 to 9 mph SW | 0% |
| Friday Night | 56°F | Mostly Clear | 1 to 9 mph WSW | 0% |
| Saturday | 80°F | Sunny | 1 to 10 mph SW | 0% |
| Saturday Night | 54°F | Mostly Clear | 0 to 10 mph WSW | 0% |
| Sunday | 75°F | Sunny | 0 to 10 mph SW | 0% |
| Sunday Night | 53°F | Mostly Clear | 1 to 10 mph WSW | 0% |
| Monday | 75°F | Mostly Sunny | 1 to 8 mph SW | 0% |
| Monday Night | 53°F | Partly Cloudy | 1 to 8 mph WSW | 1% |
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 Aug 4, 2026.