Jefferson, WI Weather & Growing Conditions
Today
70°F
Showers And Thunderstorms
Showers and thunderstorms before 9am, then a chance of showers and thunderstorms between 9am and noon, then showers and thunderstorms. Cloudy, with a high near 70. Southeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Showers And Thunderstorms | 5 to 10 mph SE | 78% |
| Tonight | 59°F | Showers And Thunderstorms | 5 to 10 mph E | 85% |
| Sunday | 66°F | Rain Showers Likely then Cloudy | 10 to 15 mph NE | 55% |
| Sunday Night | 52°F | Mostly Cloudy | 10 to 15 mph NE | 3% |
| Monday | 63°F | Cloudy | 10 to 15 mph NE | 10% |
| Monday Night | 47°F | Mostly Cloudy | 5 to 10 mph NE | 8% |
| Tuesday | 62°F | Partly Sunny | 5 to 15 mph NE | 8% |
| Tuesday Night | 46°F | Partly Cloudy | 5 to 10 mph NE | 4% |
| Wednesday | 64°F | Mostly Sunny | 5 to 10 mph NE | 3% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 0% |
| Thursday | 67°F | Mostly Sunny | 0 to 5 mph NE | 3% |
| Thursday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph NE | 2% |
| Friday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Jefferson, WI
Last spring frost
Apr 25
First fall frost
Oct 18
Growing season
173 days
Hardiness zone
5b
Explore more for Jefferson, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Jefferson Wwtp, Wi (2.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.