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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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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North Pekin
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Washington
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.