Watertown, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Watertown, a city in Jefferson County, Wisconsin.
Tonight
60°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 60. East wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Watertown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Showers And Thunderstorms | 10 to 15 mph E | 98% |
| Saturday | 70°F | Showers And Thunderstorms | 5 to 15 mph SE | 99% |
| Saturday Night | 58°F | Showers And Thunderstorms | 5 to 10 mph NE | 76% |
| Sunday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
| Sunday Night | 51°F | Mostly Cloudy | 10 to 15 mph NE | 4% |
| 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% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph NE | 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
5b
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
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.