Union Center, WI Weather & Growing Conditions
This Afternoon
79°F
Isolated Showers And Thunderstorms
Isolated showers and thunderstorms after 5pm. Mostly cloudy, with a high near 79. West wind 5 to 8 mph, with gusts as high as 18 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Isolated Showers And Thunderstorms | 5 to 8 mph W | 15% |
| Tonight | 58°F | Scattered Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 5 mph W | 67% |
| Wednesday | 78°F | Scattered Showers And Thunderstorms then Partly Sunny | 2 mph W | 32% |
| Wednesday Night | 52°F | Partly Cloudy | 2 mph NW | 0% |
| Thursday | 81°F | Sunny | 2 mph S | 0% |
| Thursday Night | 56°F | Mostly Clear | 2 mph S | 0% |
| Friday | 82°F | Sunny | 0 to 9 mph S | 7% |
| Friday Night | 62°F | Mostly Clear | 3 to 8 mph SW | 11% |
| Saturday | 85°F | Mostly Sunny | 3 to 8 mph SW | 11% |
| Saturday Night | 66°F | Partly Cloudy then Chance Rain Showers | 3 to 8 mph SW | 32% |
| Sunday | 85°F | Chance Rain Showers | 5 to 9 mph W | 32% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 1 to 7 mph S | 46% |
| Monday | 83°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 to 6 mph S | 46% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 1 to 5 mph N | 31% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Union Center, WI
Last spring frost
May 5
First fall frost
Oct 4
Growing season
153 days
Hardiness zone
4b
Explore more for Union Center, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Hillsboro, Wi (4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.