Jefferson, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jefferson, a city in Jefferson County, Wisconsin.
Overnight
58°F
Light Rain
Rain. Cloudy, with a low around 58. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Light Rain | 10 to 15 mph S | 91% |
| Wednesday | 61°F | Slight Chance Light Rain | 15 mph S | 24% |
| Wednesday Night | 45°F | Cloudy then Chance Light Rain | 15 mph SW | 36% |
| Thursday | 54°F | Light Rain Likely | 10 to 15 mph W | 61% |
| Thursday Night | 36°F | Chance Light Rain then Mostly Cloudy | 10 mph N | 27% |
| Friday | 47°F | Partly Sunny | 5 to 15 mph N | 4% |
| Friday Night | 29°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 50°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 31°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 59°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph W | 1% |
| Tuesday | 60°F | Sunny | 5 to 10 mph NW | 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.