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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.