Grand Tower, IL Weather & Growing Conditions
Overnight
55°F
Mostly Cloudy
Mostly cloudy. Low around 55, with temperatures rising to around 58 overnight. Southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Mostly Cloudy | 6 mph SW | 9% |
| Wednesday | 67°F | Partly Sunny | 5 to 8 mph W | 4% |
| Wednesday Night | 41°F | Mostly Clear | 3 mph WSW | 0% |
| Thursday | 69°F | Sunny | 2 to 6 mph SW | 0% |
| Thursday Night | 43°F | Partly Cloudy | 2 mph WNW | 1% |
| Friday | 60°F | Partly Sunny | 3 to 9 mph NNW | 0% |
| Friday Night | 36°F | Partly Cloudy | 2 to 6 mph N | 0% |
| Saturday | 57°F | Mostly Sunny | 5 mph N | 0% |
| Saturday Night | 32°F | Partly Cloudy | 1 mph N | 0% |
| Sunday | 62°F | Sunny | 0 to 5 mph NNW | 1% |
| Sunday Night | 33°F | Clear | 1 mph NNW | 0% |
| Monday | 65°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 37°F | Clear | 2 mph SW | 0% |
| Tuesday | 69°F | Sunny | 0 to 3 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grand Tower, IL
Last spring frost
Apr 9
First fall frost
Oct 22
Growing season
195 days
Hardiness zone
7a
Explore more for Grand Tower, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Carbondale Southern Il Ap, Il (15.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.