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Mackinaw, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Mackinaw, a village in Tazewell County, Illinois.

Tonight
68°F
Partly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 68. East southeast wind around 9 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.

7-day forecast for Mackinaw

WhenTempForecastWindPrecip
Tonight 68°F Partly Cloudy then Slight Chance Showers And Thunderstorms 9 mph ESE 16%
Saturday 87°F Slight Chance Showers And Thunderstorms then Mostly Cloudy 9 mph SSE 22%
Saturday Night 68°F Chance Showers And Thunderstorms 7 mph E 51%
Sunday 78°F Rain Showers Likely 3 to 14 mph NE 66%
Sunday Night 59°F Showers And Thunderstorms Likely 12 to 15 mph NE 67%
Monday 67°F Showers And Thunderstorms Likely 15 mph ENE 67%
Monday Night 54°F Chance Showers And Thunderstorms 13 to 16 mph NE 48%
Tuesday 65°F Chance Rain Showers then Mostly Cloudy 14 mph NE 28%
Tuesday Night 51°F Mostly Cloudy 6 to 14 mph NNE 6%
Wednesday 68°F Partly Sunny 10 mph NNE 4%
Wednesday Night 53°F Partly Cloudy 3 to 8 mph NNE 3%
Thursday 70°F Mostly Sunny 5 to 8 mph NNE 2%
Thursday Night 54°F Partly Cloudy 2 to 7 mph NNE 3%
Friday 72°F Mostly Sunny 5 to 8 mph NNE 3%

Forecast source: National Weather Service (api.weather.gov) for Mackinaw (40.534, -89.355). Updated through the day.

Growing snapshot for Mackinaw

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

More local growing data for Mackinaw: nearby ZIP 61755 weather · frost dates · planting calendar · Illinois frost dates

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