Union, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union, a city in Union County, Oregon.
This Afternoon
54°F
Sunny
Sunny. High near 54, with temperatures falling to around 47 in the afternoon. Southeast wind around 2 mph.
7-day forecast for Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 54°F | Sunny | 2 mph SE | 0% |
| Tonight | 37°F | Mostly Cloudy then Chance Rain Showers | 5 mph E | 36% |
| Thursday | 52°F | Chance Rain Showers then Mostly Sunny | 1 to 6 mph N | 36% |
| Thursday Night | 31°F | Mostly Clear | 2 to 14 mph SE | 0% |
| Friday | 54°F | Partly Sunny | 12 to 15 mph S | 2% |
| Friday Night | 37°F | Partly Cloudy | 12 to 17 mph S | 2% |
| Saturday | 60°F | Sunny | 17 to 26 mph S | 0% |
| Saturday Night | 41°F | Partly Cloudy | 23 to 30 mph S | 6% |
| Sunday | 58°F | Mostly Cloudy | 2 to 23 mph SW | 8% |
| Sunday Night | 37°F | Mostly Cloudy | 2 mph NW | 8% |
| Monday | 58°F | Mostly Cloudy | 2 to 7 mph S | 5% |
| Monday Night | 37°F | Mostly Cloudy then Slight Chance Rain Showers | 3 to 8 mph S | 15% |
| Tuesday | 60°F | Slight Chance Rain Showers | 8 to 12 mph S | 18% |
| Tuesday Night | 41°F | Slight Chance Rain Showers | 9 to 23 mph S | 21% |
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 Nov 5, 2026.