Union City, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union City, a village in Darke County, Ohio.
This Afternoon
74°F
Partly Sunny
Partly sunny, with a high near 74. Northeast wind around 8 mph.
7-day forecast for Union City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Partly Sunny | 8 mph NE | 1% |
| Tonight | 56°F | Partly Cloudy then Patchy Fog | 8 mph E | 3% |
| Saturday | 79°F | Showers And Thunderstorms Likely | 7 mph SE | 69% |
| Saturday Night | 65°F | Showers And Thunderstorms Likely | 7 mph S | 70% |
| Sunday | 79°F | Showers And Thunderstorms Likely | 6 to 9 mph W | 61% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely | 9 to 13 mph NE | 61% |
| Monday | 69°F | Showers And Thunderstorms Likely | 10 to 14 mph NE | 59% |
| Monday Night | 53°F | Chance Showers And Thunderstorms | 10 to 16 mph NE | 48% |
| Tuesday | 68°F | Chance Showers And Thunderstorms | 10 to 14 mph NE | 36% |
| Tuesday Night | 54°F | Slight Chance Rain Showers | 7 to 14 mph NE | 24% |
| Wednesday | 68°F | Slight Chance Rain Showers | 10 mph NE | 19% |
| Wednesday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 10 mph N | 16% |
| Thursday | 69°F | Partly Sunny | 6 to 9 mph N | 9% |
| Thursday Night | 53°F | Mostly Cloudy | 5 to 9 mph N | 9% |
Forecast source: National Weather Service (api.weather.gov) for Union City (40.199, -84.789). Updated through the day.
Growing snapshot for Union City
Last spring frost
Apr 20
First fall frost
Oct 21
Growing season
183 days
Hardiness zone
6a
More local growing data for Union City: nearby ZIP 45390 weather · frost dates · planting calendar · Ohio frost dates
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Climate data from the nearest NOAA station, Winchester Airport 3 E, In (9 mi from Union City). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.