Watertown, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Watertown, a city in Jefferson County, Wisconsin.
Overnight
60°F
Mostly Clear
Mostly clear, with a low around 60. South wind around 5 mph.
7-day forecast for Watertown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 83°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 27% |
| Tuesday Night | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 89% |
| Wednesday | 75°F | Patchy Fog | 5 mph W | 58% |
| Wednesday Night | 57°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 32% |
| Thursday | 79°F | Mostly Sunny | 0 mph | 13% |
| Thursday Night | 57°F | Mostly Clear | 0 mph | 8% |
| Friday | 81°F | Sunny | 0 to 5 mph SW | 1% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph SW | 5% |
| Saturday | 84°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 30% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 30% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph SW | 50% |
| Monday | 83°F | Chance Rain Showers | 5 mph S | 44% |
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 Aug 4, 2026.