Union City, GA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union City, a city in Fulton County, Georgia.
Overnight
65°F
Chance Showers And Thunderstorms
A chance of rain showers before 4am, then a chance of showers and thunderstorms. Cloudy, with a low around 65. Southeast wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
7-day forecast for Union City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Chance Showers And Thunderstorms | 10 mph SE | 51% |
| Wednesday | 73°F | Showers And Thunderstorms | 10 to 15 mph SE | 90% |
| Wednesday Night | 64°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 61% |
| Thursday | 77°F | Slight Chance Rain Showers | 0 to 5 mph SW | 19% |
| Thursday Night | 57°F | Partly Cloudy then Slight Chance Rain Showers | 0 mph | 15% |
| Friday | 75°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph NW | 15% |
| Friday Night | 49°F | Clear | 5 to 10 mph NW | 3% |
| Saturday | 70°F | Sunny | 10 mph NW | 0% |
| Saturday Night | 43°F | Partly Cloudy | 5 to 10 mph N | 0% |
| Sunday | 68°F | Sunny | 5 mph N | 0% |
| Sunday Night | 43°F | Mostly Clear | 5 mph NW | 1% |
| Monday | 66°F | Sunny | 5 mph N | 2% |
| Monday Night | 41°F | Mostly Clear | 0 to 5 mph NW | 3% |
| Tuesday | 69°F | Sunny | 0 to 5 mph NW | 5% |
Forecast source: National Weather Service (api.weather.gov) for Union City (33.594, -84.563). Updated through the day.
Growing snapshot for Union City
Last spring frost
Mar 15
First fall frost
Nov 20
Growing season
252 days
Hardiness zone
8a
More local growing data for Union City: nearby ZIP 30291 weather · frost dates · planting calendar · Georgia frost dates
Nearby towns & communities
Alpharetta
Atlanta
Chattahoochee Hills
College Park
Duluth
East Point
Fairburn
Hapeville
Johns Creek
Milton
Mountain Park
Palmetto
Roswell
Sandy Springs
South Fulton
Climate data from the nearest NOAA station, Atlanta Hartsfield Intl Ap, Ga (7 mi from Union City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.