Harman US

Hartford, IL Weather & Growing Conditions

Today
98°F
Partly Sunny
Partly sunny, with a high near 98. Heat index values as high as 101. Southwest wind 3 to 8 mph.

7-day forecast

WhenTempForecastWindPrecip
Today 98°F Partly Sunny 3 to 8 mph SW 5%
Tonight 73°F Partly Cloudy 5 mph SW 3%
Sunday 93°F Chance Rain Showers then Slight Chance Showers And Thunderstorms 3 to 7 mph NW 32%
Sunday Night 66°F Showers And Thunderstorms Likely 6 to 10 mph NE 62%
Monday 79°F Showers And Thunderstorms Likely 7 to 13 mph NE 65%
Monday Night 59°F Chance Showers And Thunderstorms 7 to 13 mph NE 50%
Tuesday 72°F Slight Chance Rain Showers then Partly Sunny 9 to 13 mph NE 19%
Tuesday Night 54°F Mostly Cloudy 6 to 13 mph N 6%
Wednesday 75°F Mostly Sunny 8 to 12 mph N 1%
Wednesday Night 55°F Partly Cloudy 3 to 10 mph N 0%
Thursday 77°F Mostly Sunny 5 to 9 mph N 1%
Thursday Night 57°F Partly Cloudy 3 to 9 mph NE 3%
Friday 79°F Mostly Sunny 3 to 8 mph NE 6%
Friday Night 57°F Partly Cloudy 3 to 7 mph NE 6%

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

Growing snapshot for Hartford, IL

Last spring frost
Apr 4
First fall frost
Nov 5
Growing season
214 days
Hardiness zone
7a

Explore more for Hartford, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Alton - Melvin Price L&D, Il (5.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.