Sun Prairie, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sun Prairie, a city in Dane County, Wisconsin.
This Afternoon
69°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. High near 69, with temperatures falling to around 64 in the afternoon. East wind around 15 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sun Prairie
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Chance Rain Showers | 15 mph E | 53% |
| Tonight | 58°F | Showers And Thunderstorms | 10 to 15 mph E | 99% |
| Saturday | 72°F | Showers And Thunderstorms | 10 mph SE | 93% |
| Saturday Night | 57°F | Showers And Thunderstorms | 10 to 15 mph NE | 77% |
| Sunday | 67°F | Chance Rain Showers | 15 mph NE | 33% |
| Sunday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph NE | 18% |
| Monday | 63°F | Mostly Cloudy then Chance Rain Showers | 15 mph NE | 27% |
| Monday Night | 47°F | Chance Rain Showers | 10 mph NE | 27% |
| Tuesday | 62°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph NE | 18% |
| Tuesday Night | 46°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph NE | 6% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 0 to 5 mph NE | 5% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Sun Prairie (43.183, -89.238). Updated through the day.
Growing snapshot for Sun Prairie
Last spring frost
May 1
First fall frost
Oct 10
Growing season
160 days
Hardiness zone
5a
More local growing data for Sun Prairie: nearby ZIP 53590 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Belleville
Black Earth
Blue Mounds
Cambridge
Cottage Grove
Cross Plains
Dane
Deerfield
DeForest
Fitchburg
Lake Ripley
Madison
Maple Bluff
Marshall
Mazomanie
McFarland
Middleton
Monona
Mount Horeb
Oregon
Rockdale
Shorewood Hills
Stoughton
Verona
Waunakee
Windsor
Climate data from the nearest NOAA station, Madison Dane Rgnl Ap, Wi (8.1 mi from Sun Prairie). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.