Union, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union, a city in Union County, Oregon.
This Afternoon
56°F
Slight Chance Rain Showers
A slight chance of rain showers before 4pm. Mostly cloudy. High near 56, with temperatures falling to around 50 in the afternoon. South wind 6 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
7-day forecast for Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Slight Chance Rain Showers | 6 to 16 mph S | 15% |
| Tonight | 32°F | Patchy Fog then Patchy Freezing Fog | 3 mph E | 1% |
| Wednesday | 57°F | Patchy Freezing Fog then Sunny | 2 mph NE | 0% |
| Wednesday Night | 35°F | Patchy Fog then Chance Rain Showers | 3 mph E | 47% |
| Thursday | 54°F | Chance Rain Showers then Partly Sunny | 3 mph N | 47% |
| Thursday Night | 33°F | Partly Cloudy | 2 to 15 mph SE | 5% |
| Friday | 55°F | Partly Sunny | 9 to 15 mph S | 10% |
| Friday Night | 37°F | Mostly Cloudy | 9 to 17 mph S | 6% |
| Saturday | 61°F | Mostly Sunny | 17 to 25 mph S | 1% |
| Saturday Night | 42°F | Mostly Cloudy | 22 to 30 mph S | 8% |
| Sunday | 60°F | Partly Sunny | 3 to 23 mph S | 12% |
| Sunday Night | 38°F | Mostly Cloudy | 6 mph E | 12% |
| Monday | 60°F | Partly Sunny | 5 to 8 mph S | 13% |
| Monday Night | 39°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 9 mph S | 15% |
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 4, 2026.