Union, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union, a city in Union County, Oregon.
This Afternoon
74°F
Sunny
Sunny. High near 74, with temperatures falling to around 72 in the afternoon. Northwest wind 8 to 12 mph.
7-day forecast for Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Sunny | 8 to 12 mph NW | 12% |
| Tonight | 47°F | Mostly Clear | 3 to 9 mph N | 6% |
| Saturday | 79°F | Sunny | 2 to 10 mph N | 1% |
| Saturday Night | 48°F | Mostly Clear | 1 to 8 mph NE | 0% |
| Sunday | 82°F | Sunny | 1 to 5 mph SE | 0% |
| Sunday Night | 51°F | Mostly Clear | 2 to 6 mph E | 0% |
| Monday | 84°F | Sunny | 6 mph S | 0% |
| Monday Night | 51°F | Mostly Clear | 3 mph N | 0% |
| Tuesday | 83°F | Sunny | 1 to 6 mph SW | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 2 to 6 mph NW | 1% |
| Wednesday | 80°F | Sunny | 2 to 7 mph NW | 2% |
| Wednesday Night | 50°F | Partly Cloudy | 3 to 7 mph N | 2% |
| Thursday | 85°F | Sunny | 6 to 16 mph S | 1% |
| Thursday Night | 52°F | Partly Cloudy | 9 to 14 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov) for Union (45.209, -117.868). Updated through the day.
Growing snapshot for Union
Last spring frost
May 11
First fall frost
Sep 26
Growing season
136 days
Hardiness zone
6b
More local growing data for Union: nearby ZIP 97824 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Union, Or (12 mi from Union). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.