Union Gap, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union Gap, a city in Yakima County, Washington.
Overnight
52°F
Mostly Clear
Mostly clear. Low around 52, with temperatures rising to around 54 overnight. Northwest wind around 3 mph.
7-day forecast for Union Gap
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Mostly Clear | 3 mph NW | 0% |
| Saturday | 82°F | Sunny | 1 to 5 mph W | 0% |
| Saturday Night | 53°F | Mostly Clear | 3 mph N | 0% |
| Sunday | 83°F | Sunny | 3 mph N | 0% |
| Sunday Night | 54°F | Mostly Clear | 3 mph N | 0% |
| Monday | 84°F | Sunny | 1 to 5 mph N | 0% |
| Monday Night | 53°F | Partly Cloudy | 6 mph N | 0% |
| Tuesday | 80°F | Mostly Sunny | 2 to 6 mph N | 0% |
| Tuesday Night | 51°F | Partly Cloudy | 7 mph N | 0% |
| Wednesday | 75°F | Mostly Sunny | 2 to 6 mph N | 1% |
| Wednesday Night | 49°F | Mostly Cloudy | 7 mph N | 1% |
| Thursday | 71°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 49°F | Mostly Cloudy | 5 mph N | 7% |
| Friday | 69°F | Mostly Sunny | 7 mph NW | 5% |
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 Sep 19, 2026.