Harman US

Mackinaw, IL Weather & Growing Conditions

This Afternoon
83°F
Slight Chance Rain Showers
A slight chance of rain showers between 4pm and 5pm. Mostly cloudy, with a high near 83. South wind around 8 mph. Chance of precipitation is 20%.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 83°F Slight Chance Rain Showers 8 mph S 16%
Tonight 68°F Mostly Cloudy then Slight Chance Showers And Thunderstorms 8 mph SSW 23%
Sunday 77°F Chance Showers And Thunderstorms 7 to 14 mph NNE 39%
Sunday Night 58°F Chance Showers And Thunderstorms 14 mph ENE 47%
Monday 66°F Rain Showers Likely 15 mph ENE 67%
Monday Night 54°F Chance Rain Showers 12 to 15 mph ENE 53%
Tuesday 64°F Chance Rain Showers 14 mph NE 53%
Tuesday Night 52°F Mostly Cloudy 7 to 14 mph NE 12%
Wednesday 67°F Partly Sunny 10 mph NNE 3%
Wednesday Night 53°F Partly Cloudy 3 to 10 mph NNE 1%
Thursday 70°F Mostly Sunny 7 mph NNE 2%
Thursday Night 55°F Slight Chance Rain Showers 2 to 6 mph NE 15%
Friday 74°F Partly Sunny 3 to 7 mph NE 8%
Friday Night 55°F Partly Cloudy 6 mph NE 8%

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

Growing snapshot for Mackinaw, IL

Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
6a

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

Climate data from the nearest NOAA station, Congerville 2Nw, Il (8.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.