Harman US

Park Forest, IL Weather & Growing Conditions

This Afternoon
72°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy. High near 72, with temperatures falling to around 70 in the afternoon. South wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 72°F Chance Showers And Thunderstorms 5 mph S 31%
Tonight 66°F Showers And Thunderstorms 5 mph SSE 91%
Sunday 69°F Showers And Thunderstorms 5 to 15 mph NNE 84%
Sunday Night 56°F Chance Rain Showers 10 to 15 mph NE 49%
Monday 65°F Chance Rain Showers 15 mph ENE 43%
Monday Night 54°F Chance Rain Showers 10 to 15 mph ENE 33%
Tuesday 63°F Chance Rain Showers 10 to 15 mph NE 33%
Tuesday Night 54°F Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 29%
Wednesday 65°F Partly Sunny 10 mph NE 14%
Wednesday Night 54°F Mostly Cloudy 5 to 10 mph NE 7%
Thursday 68°F Partly Sunny 5 to 10 mph NE 2%
Thursday Night 55°F Mostly Cloudy 0 to 5 mph NE 7%
Friday 72°F Partly Sunny 0 to 10 mph NE 7%
Friday Night 55°F Partly Cloudy 0 to 5 mph NE 3%

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

Growing snapshot for Park Forest, IL

Last spring frost
Apr 23
First fall frost
Oct 20
Growing season
179 days
Hardiness zone
6a

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

Climate data from the nearest NOAA station, Park Forest, Il (1.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.