Waterloo, WI Weather & Growing Conditions

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

This Afternoon

70°F

Light Rain Likely

Rain likely before 3pm, then rain likely and a slight chance of thunderstorms. Cloudy, with a high near 70. South wind around 15 mph, with gusts as high as 35 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast for Waterloo

When	Temp	Forecast	Wind	Precip
This Afternoon	70°F	Light Rain Likely	15 mph S	74%
Tonight	56°F	Light Rain	10 to 15 mph S	88%
Wednesday	61°F	Light Rain	10 to 15 mph S	82%
Wednesday Night	46°F	Light Rain Likely	10 to 15 mph SW	66%
Thursday	54°F	Light Rain	5 to 10 mph W	80%
Thursday Night	37°F	Chance Light Rain	5 to 10 mph N	42%
Friday	48°F	Slight Chance Light Rain then Partly Sunny	5 to 15 mph N	19%
Friday Night	30°F	Partly Cloudy	0 to 5 mph N	2%
Saturday	52°F	Mostly Sunny	0 to 5 mph W	2%
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	6%
Monday	59°F	Mostly Sunny	5 to 15 mph SW	1%
Monday Night	38°F	Mostly Clear	5 to 10 mph W	1%

Forecast source: National Weather Service (api.weather.gov) for Waterloo (43.184, -88.990). Updated through the day.

Growing snapshot for Waterloo

Last spring frost

Apr 30

First fall frost

Oct 9

Growing season

163 days

Hardiness zone

More local growing data for Waterloo: nearby ZIP 53594 weather · frost dates · planting calendar · Wisconsin frost dates

Nearby towns & communities

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

All Wisconsin locations ›

Climate data from the nearest NOAA station, Waterloo Wwtp, Wi (0.8 mi from Waterloo). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.