Jefferson, WI Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Jefferson, a city in Jefferson County, Wisconsin.

Overnight

61°F

Showers And Thunderstorms

Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 61. East wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

7-day forecast for Jefferson

When	Temp	Forecast	Wind	Precip
Overnight	61°F	Showers And Thunderstorms	10 to 15 mph E	100%
Saturday	70°F	Showers And Thunderstorms	5 to 15 mph SE	100%
Saturday Night	59°F	Showers And Thunderstorms	5 to 10 mph NE	78%
Sunday	66°F	Scattered Rain Showers	10 to 15 mph NE	35%
Sunday Night	51°F	Mostly Cloudy	10 to 15 mph NE	8%
Monday	63°F	Mostly Cloudy	10 to 15 mph NE	11%
Monday Night	47°F	Mostly Cloudy	5 to 10 mph NE	9%
Tuesday	62°F	Partly Sunny	5 to 15 mph NE	8%
Tuesday Night	46°F	Partly Cloudy	5 to 10 mph NE	4%
Wednesday	65°F	Mostly Sunny	5 to 10 mph NE	3%
Wednesday Night	47°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	3%

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

More local growing data for Jefferson: nearby ZIP 53549 weather · frost dates · planting calendar · Wisconsin frost dates

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Fort Atkinson Hebron Helenville Ixonia Johnson Creek Lake Mills Palmyra Rome Sullivan Waterloo Watertown

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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 Sep 19, 2026.