Grant Park, IL Weather & Growing Conditions
Tonight
60°F
Rain Showers Likely
Rain showers likely. Cloudy. Low around 60, with temperatures rising to around 62 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Rain Showers Likely | 15 mph S | 72% |
| Wednesday | 65°F | Chance Rain Showers then Mostly Cloudy | 15 mph SSW | 52% |
| Wednesday Night | 47°F | Mostly Cloudy | 10 to 15 mph SW | 5% |
| Thursday | 59°F | Mostly Cloudy | 10 to 15 mph WSW | 10% |
| Thursday Night | 43°F | Chance Rain Showers | 5 mph WNW | 36% |
| Friday | 54°F | Chance Rain Showers | 5 to 10 mph NNW | 26% |
| Friday Night | 35°F | Partly Cloudy | 0 to 10 mph NNW | 11% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 10% |
| Saturday Night | 32°F | Partly Cloudy | 0 mph | 5% |
| Sunday | 57°F | Mostly Sunny | 0 to 10 mph W | 12% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph WNW | 9% |
| Monday | 62°F | Sunny | 5 to 10 mph WSW | 6% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph WSW | 2% |
| Tuesday | 63°F | Sunny | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grant Park, IL
Last spring frost
Apr 29
First fall frost
Oct 16
Growing season
171 days
Hardiness zone
5b
Explore more for Grant Park, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lowell, In (11.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.