Grant Park, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Tonight | 63°F | Partly Cloudy | 0 to 5 mph S | 1% |
| Wednesday | 82°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 30% |
| Wednesday Night | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph WSW | 85% |
| Thursday | 78°F | Showers And Thunderstorms | 0 to 5 mph SSW | 85% |
| Thursday Night | 61°F | Chance Showers And Thunderstorms | 0 to 5 mph SSE | 53% |
| Friday | 81°F | Mostly Sunny | 0 mph | 7% |
| Friday Night | 62°F | Partly Cloudy | 0 mph | 10% |
| Saturday | 83°F | Mostly Sunny | 0 to 5 mph SSW | 10% |
| Saturday Night | 67°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 15% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 15 mph SW | 15% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 33% |
| Monday | 85°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 33% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 41% |
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 Aug 4, 2026.