Union Center, WI Weather & Growing Conditions
This Afternoon
64°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy, with a high near 64. East wind around 6 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Chance Showers And Thunderstorms | 6 mph E | 52% |
| Tonight | 52°F | Showers And Thunderstorms Likely | 8 mph NE | 60% |
| Sunday | 68°F | Partly Sunny | 8 to 13 mph NE | 13% |
| Sunday Night | 46°F | Mostly Cloudy | 10 mph NE | 3% |
| Monday | 62°F | Mostly Cloudy then Slight Chance Rain Showers | 8 to 12 mph NE | 23% |
| Monday Night | 43°F | Chance Rain Showers | 5 to 9 mph NE | 26% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 5 to 9 mph NE | 26% |
| Tuesday Night | 42°F | Partly Cloudy | 2 to 6 mph NE | 2% |
| Wednesday | 65°F | Mostly Sunny | 2 to 7 mph NE | 2% |
| Wednesday Night | 45°F | Partly Cloudy | 0 to 3 mph NE | 1% |
| Thursday | 67°F | Partly Sunny then Slight Chance Rain Showers | 0 to 3 mph E | 15% |
| Thursday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 1 mph NE | 15% |
| Friday | 71°F | Partly Sunny | 2 mph NE | 6% |
| Friday Night | 49°F | Partly Cloudy | 1 mph NE | 5% |
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 Sep 19, 2026.