Harman US

Oak Forest, IL Weather & Growing Conditions

This Afternoon
72°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy, with a high near 72. Southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 50%. 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 SE 46%
Tonight 66°F Chance Showers And Thunderstorms then Showers And Thunderstorms 5 mph S 99%
Sunday 69°F Showers And Thunderstorms 5 to 15 mph NNE 84%
Sunday Night 57°F Chance Rain Showers 15 mph NE 40%
Monday 64°F Chance Rain Showers 15 mph ENE 42%
Monday Night 54°F Chance Rain Showers 10 to 15 mph ENE 30%
Tuesday 63°F Chance Rain Showers 10 to 15 mph NE 31%
Tuesday Night 54°F Slight Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 24%
Wednesday 64°F Mostly Cloudy 10 mph NE 14%
Wednesday Night 54°F Mostly Cloudy 5 to 10 mph NE 7%
Thursday 67°F Partly Sunny 5 to 10 mph NE 2%
Thursday Night 56°F Mostly Cloudy 5 to 10 mph NE 8%
Friday 71°F Partly Sunny 5 to 10 mph NE 8%
Friday Night 56°F Partly Cloudy 0 to 10 mph NE 3%

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

Growing snapshot for Oak Forest, IL

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

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

Climate data from the nearest NOAA station, Park Forest, Il (8.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.