Union, WA Weather & Growing Conditions
Tonight
37°F
Patchy Fog
Patchy fog after 10pm. Mostly clear, with a low around 37. Wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 37°F | Patchy Fog | 0 mph | 4% |
| Wednesday | 54°F | Patchy Fog then Chance Light Rain | 0 to 5 mph SSW | 52% |
| Wednesday Night | 44°F | Light Rain | 5 to 12 mph SSW | 100% |
| Thursday | 54°F | Slight Chance Light Rain | 6 to 9 mph SW | 24% |
| Thursday Night | 44°F | Light Rain | 6 mph SSW | 89% |
| Friday | 53°F | Light Rain | 5 to 8 mph SSW | 89% |
| Friday Night | 44°F | Chance Light Rain | 1 to 6 mph WSW | 48% |
| Saturday | 57°F | Chance Light Rain | 5 mph SSW | 48% |
| Saturday Night | 47°F | Rain | 5 to 23 mph SSW | 87% |
| Sunday | 54°F | Light Rain Likely | 6 to 17 mph SW | 71% |
| Sunday Night | 41°F | Chance Light Rain | 1 to 6 mph NW | 34% |
| Monday | 53°F | Light Rain Likely | 1 to 5 mph E | 60% |
| Monday Night | 44°F | Rain | 7 mph SSW | 79% |
| Tuesday | 54°F | Light Rain | 5 to 9 mph SSW | 79% |
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 Nov 4, 2026.