Grand Tower, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Tower, a city in Jackson County, Illinois.
Overnight
54°F
Slight Chance Rain Showers
A slight chance of rain showers before 2am. Mostly cloudy. Low around 54, with temperatures rising to around 58 overnight. Southwest wind around 8 mph. Chance of precipitation is 20%.
7-day forecast for Grand Tower
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Rain Showers | 8 mph SW | 18% |
| Wednesday | 67°F | Partly Sunny | 3 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 | 35°F | Partly Cloudy | 5 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 | 66°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 36°F | Clear | 2 mph WSW | 0% |
| Tuesday | 70°F | Sunny | 3 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Grand Tower (37.642, -89.507). Updated through the day.
Growing snapshot for Grand Tower
Last spring frost
Apr 9
First fall frost
Oct 22
Growing season
195 days
Hardiness zone
7a
More local growing data for Grand Tower: nearby ZIP 62942 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Ava
Campbell Hill
Carbondale
De Soto
Dowell
Elkville
Gorham
Harrison
Makanda
Murphysboro
Rockwood
Vergennes
Climate data from the nearest NOAA station, Carbondale Southern Il Ap, Il (15.8 mi from Grand Tower). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.