Watertown, WI Weather & Growing Conditions
Today
83°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of rain showers between 3pm and 4pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Southwest wind 5 to 10 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 24% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 90% |
| Wednesday | 75°F | Patchy Fog | 5 mph W | 61% |
| Wednesday Night | 58°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 34% |
| Thursday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 0 mph | 15% |
| Thursday Night | 57°F | Mostly Clear | 0 mph | 7% |
| Friday | 81°F | Sunny | 0 to 5 mph SW | 2% |
| Friday Night | 61°F | Mostly Clear | 0 to 5 mph SW | 5% |
| Saturday | 83°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 | 49% |
| Monday | 83°F | Chance Rain Showers | 5 mph S | 45% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 5 mph NW | 44% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Watertown, WI
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
167 days
Hardiness zone
5b
Explore more for Watertown, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Watertown Wwtp, Wi (2.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.