Union Gap, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union Gap, a city in Yakima County, Washington.
This Afternoon
56°F
Mostly Cloudy
Mostly cloudy. High near 56, with temperatures falling to around 51 in the afternoon. South wind around 3 mph.
7-day forecast for Union Gap
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Mostly Cloudy | 3 mph S | 3% |
| Tonight | 32°F | Partly Cloudy then Areas Of Fog | 0 to 3 mph NW | 3% |
| Wednesday | 55°F | Areas Of Fog then Sunny | 0 to 5 mph SE | 6% |
| Wednesday Night | 37°F | Chance Rain Showers | 2 mph NE | 47% |
| Thursday | 59°F | Patchy Fog then Mostly Sunny | 0 to 3 mph W | 1% |
| Thursday Night | 35°F | Partly Cloudy | 2 mph NW | 5% |
| Friday | 58°F | Mostly Cloudy | 2 mph S | 5% |
| Friday Night | 35°F | Mostly Cloudy | 2 mph NW | 2% |
| Saturday | 59°F | Partly Sunny | 2 mph E | 0% |
| Saturday Night | 37°F | Mostly Cloudy | 1 mph NW | 12% |
| Sunday | 61°F | Partly Sunny | 0 to 8 mph SW | 12% |
| Sunday Night | 34°F | Mostly Cloudy | 0 to 3 mph NW | 6% |
| Monday | 57°F | Partly Sunny | 1 mph NE | 12% |
| Monday Night | 36°F | Chance Rain Showers | 1 mph NE | 35% |
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
Nearby towns & communities
Ahtanum
Buena
Cliffdell
Cowiche
Donald
Eschbach
Gleed
Grandview
Granger
Harrah
Mabton
Moxee
Naches
Nile
Outlook
Parker
Selah
Summitview
Sunnyside
Tampico
Terrace Heights
Tieton
Toppenish
Wapato
White Swan
Yakima
Zillah
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 Nov 4, 2026.