Mackinaw, IL Weather & Growing Conditions
Overnight
69°F
Mostly Cloudy
Mostly cloudy, with a low around 69. South southeast wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 69°F | Mostly Cloudy | 8 mph SSE | 7% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 8 mph SE | 34% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 6 mph SSW | 52% |
| Sunday | 75°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 14 mph NNW | 70% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 16 mph NE | 62% |
| Monday | 65°F | Showers And Thunderstorms Likely | 16 mph ENE | 64% |
| Monday Night | 53°F | Chance Rain Showers | 12 to 16 mph NE | 47% |
| Tuesday | 64°F | Slight Chance Rain Showers | 15 mph NE | 22% |
| Tuesday Night | 51°F | Slight Chance Rain Showers then Partly Cloudy | 8 to 14 mph NNE | 15% |
| Wednesday | 67°F | Mostly Sunny | 12 mph NNE | 4% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 10 mph NNE | 1% |
| Thursday | 69°F | Mostly Sunny | 8 mph NNE | 2% |
| Thursday Night | 54°F | Partly Cloudy | 3 to 7 mph NE | 2% |
| Friday | 72°F | Mostly Sunny | 5 to 8 mph NE | 3% |
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.