Watertown, WI Weather & Growing Conditions

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

This Afternoon

70°F

Rain Showers Likely

Rain showers likely. Mostly cloudy. High near 70, with temperatures falling to around 64 in the afternoon. East wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Watertown

When	Temp	Forecast	Wind	Precip
This Afternoon	70°F	Rain Showers Likely	10 mph E	67%
Tonight	59°F	Showers And Thunderstorms	10 to 15 mph E	100%
Saturday	72°F	Showers And Thunderstorms	10 to 15 mph SE	95%
Saturday Night	58°F	Showers And Thunderstorms Likely	10 mph NE	74%
Sunday	68°F	Chance Rain Showers	10 to 15 mph NE	34%
Sunday Night	51°F	Slight Chance Rain Showers then Mostly Cloudy	10 to 15 mph NE	18%
Monday	63°F	Mostly Cloudy	10 to 15 mph NE	14%
Monday Night	48°F	Mostly Cloudy	5 to 10 mph NE	14%
Tuesday	62°F	Partly Sunny	10 to 15 mph NE	14%
Tuesday Night	46°F	Partly Cloudy	5 to 10 mph NE	7%
Wednesday	65°F	Mostly Sunny	5 to 10 mph NE	6%
Wednesday Night	48°F	Partly Cloudy	0 to 5 mph NE	3%
Thursday	68°F	Mostly Sunny	0 to 5 mph NE	3%
Thursday Night	49°F	Partly Cloudy	0 to 5 mph N	4%

Forecast source: National Weather Service (api.weather.gov) for Watertown (43.189, -88.729). Updated through the day.

Growing snapshot for Watertown

Last spring frost

Apr 28

First fall frost

Oct 12

Growing season

167 days

Hardiness zone

More local growing data for Watertown: nearby ZIP 53094 weather · frost dates · planting calendar · Wisconsin frost dates

Nearby towns & communities

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

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Climate data from the nearest NOAA station, Watertown Wwtp, Wi (2.1 mi from Watertown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.