Jefferson, WI Weather & Growing Conditions
This Afternoon
69°F
Rain Showers Likely
Rain showers likely. Cloudy. High near 69, with temperatures falling to around 64 in the afternoon. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Rain Showers Likely | 15 mph S | 74% |
| Tonight | 58°F | Rain Showers | 10 to 15 mph S | 87% |
| Wednesday | 61°F | Rain Showers | 10 to 15 mph S | 82% |
| Wednesday Night | 45°F | Chance Rain Showers then Light Rain Likely | 10 to 15 mph SW | 55% |
| Thursday | 54°F | Light Rain Likely | 5 to 10 mph W | 74% |
| Thursday Night | 38°F | Chance Light Rain | 5 to 10 mph NW | 48% |
| Friday | 49°F | Slight Chance Light Rain then Mostly Cloudy | 10 to 15 mph N | 18% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 2% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 4% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph W | 8% |
| Sunday | 57°F | Slight Chance Light Rain | 5 to 10 mph W | 16% |
| Sunday Night | 33°F | Mostly Clear | 5 mph W | 5% |
| Monday | 59°F | Mostly Sunny | 5 to 15 mph SW | 1% |
| Monday Night | 37°F | Mostly Clear | 5 to 10 mph W | 1% |
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 Nov 4, 2026.