Sun Prairie, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sun Prairie, a city in Dane County, Wisconsin.
Today
82°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 2pm and 3pm, then a chance of showers and thunderstorms between 3pm and 4pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 82. Southwest wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sun Prairie
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 35% |
| Tonight | 61°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph W | 83% |
| Wednesday | 75°F | Patchy Fog then Mostly Cloudy | 5 mph W | 44% |
| Wednesday Night | 57°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 18% |
| Thursday | 78°F | Mostly Sunny | 0 mph | 11% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 5% |
| Friday | 81°F | Sunny | 0 to 5 mph SW | 2% |
| Friday Night | 63°F | Mostly Clear | 5 mph SW | 4% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SW | 13% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 5 mph SW | 31% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 31% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph SW | 49% |
| Monday | 82°F | Chance Rain Showers | 5 mph SW | 49% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 5 mph N | 43% |
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 Aug 4, 2026.