Jefferson, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jefferson, a city in Jefferson County, Wisconsin.
This Afternoon
69°F
Light Rain Likely
Rain likely and a slight chance of thunderstorms. Cloudy. High near 69, with temperatures falling to around 64 in the afternoon. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Light Rain Likely | 5 to 15 mph S | 63% |
| Tonight | 58°F | Light Rain | 10 to 15 mph S | 87% |
| Wednesday | 61°F | Light Rain | 10 to 15 mph S | 81% |
| Wednesday Night | 45°F | Light Rain Likely | 10 to 15 mph SW | 56% |
| Thursday | 54°F | Light Rain Likely | 5 to 10 mph W | 74% |
| Thursday Night | 37°F | Chance Light Rain | 5 to 10 mph N | 47% |
| Friday | 49°F | Slight Chance Light Rain then Mostly Cloudy | 5 to 15 mph N | 18% |
| Friday Night | 30°F | Partly Cloudy | 0 to 5 mph N | 1% |
| 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) for Jefferson (43.004, -88.808). Updated through the day.
Growing snapshot for Jefferson
Last spring frost
Apr 25
First fall frost
Oct 18
Growing season
173 days
Hardiness zone
5b
More local growing data for Jefferson: nearby ZIP 53549 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Fort Atkinson
Hebron
Helenville
Ixonia
Johnson Creek
Lake Mills
Palmyra
Rome
Sullivan
Waterloo
Watertown
Climate data from the nearest NOAA station, Jefferson Wwtp, Wi (2.1 mi from Jefferson). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.