Union Gap, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union Gap, a city in Yakima County, Washington.
Today
90°F
Areas Of Smoke
Areas of smoke. Sunny. High near 90, with temperatures falling to around 88 in the afternoon. East wind around 6 mph.
7-day forecast for Union Gap
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Areas Of Smoke | 6 mph E | 0% |
| Tonight | 59°F | Areas Of Smoke | 1 to 6 mph NW | 0% |
| Wednesday | 96°F | Areas Of Smoke | 2 to 6 mph SW | 0% |
| Wednesday Night | 62°F | Areas Of Smoke then Clear | 1 to 5 mph N | 0% |
| Thursday | 101°F | Sunny | 2 to 6 mph W | 0% |
| Thursday Night | 64°F | Clear | 5 to 8 mph NW | 0% |
| Friday | 99°F | Sunny | 2 to 13 mph W | 0% |
| Friday Night | 63°F | Clear | 7 to 14 mph NW | 0% |
| Saturday | 95°F | Sunny | 2 to 9 mph NW | 0% |
| Saturday Night | 61°F | Mostly Clear | 8 to 14 mph NW | 0% |
| Sunday | 91°F | Sunny | 3 to 8 mph NW | 0% |
| Sunday Night | 58°F | Mostly Clear | 7 to 12 mph NW | 0% |
| Monday | 90°F | Sunny | 2 to 7 mph NW | 0% |
| Monday Night | 58°F | Mostly Clear | 6 to 12 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Union Gap (46.554, -120.492). Updated through the day.
Growing snapshot for Union Gap
Last spring frost
Apr 21
First fall frost
Oct 15
Growing season
176 days
Hardiness zone
7a
More local growing data for Union Gap: nearby ZIP 98939 weather · frost dates · planting calendar · Washington frost dates
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Climate data from the nearest NOAA station, Wapato, Wa (5.1 mi from Union Gap). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.