Watertown, WI Weather & Growing Conditions
This Afternoon
66°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 3pm, then scattered showers and thunderstorms between 3pm and 5pm, then a chance of showers and thunderstorms. Cloudy, with a high near 66. East wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Slight Chance Showers And Thunderstorms | 5 mph E | 52% |
| Tonight | 59°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph NE | 77% |
| Sunday | 66°F | Scattered Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 37% |
| Sunday Night | 53°F | Mostly Cloudy | 10 to 15 mph NE | 2% |
| Monday | 63°F | Mostly Cloudy | 10 to 15 mph NE | 7% |
| Monday Night | 48°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph NE | 15% |
| Tuesday | 61°F | Slight Chance Rain Showers then Partly Sunny | 5 to 15 mph NE | 15% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 6% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NE | 5% |
| Thursday Night | 50°F | Mostly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 71°F | Partly Sunny | 0 to 5 mph NE | 5% |
| Friday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 5% |
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
5a
Explore more for Watertown, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Watertown Wwtp, Wi (5.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.