Harman US

Hartford, WI Weather & Growing Conditions

Today
66°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a high near 66. East wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Today 66°F Showers And Thunderstorms 5 to 10 mph E 76%
Tonight 58°F Showers And Thunderstorms 5 to 10 mph NE 80%
Sunday 64°F Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 32%
Sunday Night 51°F Mostly Cloudy 10 to 15 mph NE 1%
Monday 61°F Mostly Cloudy 10 to 15 mph NE 5%
Monday Night 47°F Mostly Cloudy 5 to 10 mph NE 3%
Tuesday 60°F Partly Sunny 5 to 15 mph NE 5%
Tuesday Night 47°F Partly Cloudy 5 to 10 mph NE 5%
Wednesday 63°F Mostly Sunny 5 to 10 mph NE 4%
Wednesday Night 48°F Partly Cloudy 0 to 5 mph NE 1%
Thursday 65°F Mostly Sunny 0 to 5 mph NE 4%
Thursday Night 49°F Partly Cloudy 0 to 5 mph NE 3%
Friday 69°F Mostly Sunny 0 to 5 mph NE 3%
Friday Night 49°F Partly Cloudy 0 to 5 mph NE 2%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Hartford, WI

Last spring frost
May 8
First fall frost
Oct 3
Growing season
148 days
Hardiness zone
5a

Explore more for Hartford, WI: full frost dates · planting calendar · Wisconsin frost dates

Climate data from the nearest NOAA station, Hartford Wwtp, Wi (2.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.