Sun Prairie, WI Weather & Growing Conditions
This Afternoon
67°F
Light Rain Likely
Rain likely and a slight chance of thunderstorms. Cloudy, with a high near 67. South wind 5 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Light Rain Likely | 5 to 15 mph S | 59% |
| Tonight | 57°F | Light Rain | 10 to 15 mph S | 91% |
| Wednesday | 60°F | Light Rain | 10 to 15 mph S | 78% |
| Wednesday Night | 46°F | Light Rain Likely | 10 to 15 mph SW | 67% |
| Thursday | 53°F | Light Rain | 10 mph W | 81% |
| Thursday Night | 38°F | Chance Light Rain | 10 to 15 mph N | 33% |
| Friday | 48°F | Slight Chance Light Rain then Partly Sunny | 5 to 15 mph N | 18% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 3% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph W | 1% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph W | 8% |
| Sunday | 57°F | Slight Chance Light Rain | 5 to 10 mph W | 16% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 6% |
| Monday | 59°F | Mostly Sunny | 5 to 15 mph SW | 1% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sun Prairie, WI
Last spring frost
May 1
First fall frost
Oct 10
Growing season
160 days
Hardiness zone
5a
Explore more for Sun Prairie, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Madison Dane Rgnl Ap, Wi (8.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.