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
71°F
Clear
Clear. Low around 71, with temperatures rising to around 73 overnight. South wind around 1 mph.
7-day forecast for Grand Tower
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 71°F | Clear | 1 mph S | 1% |
| Saturday | 99°F | Sunny | 2 to 6 mph SW | 2% |
| Saturday Night | 71°F | Mostly Clear | 5 mph SSW | 1% |
| Sunday | 96°F | Mostly Sunny | 5 mph WSW | 1% |
| Sunday Night | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 3 mph N | 31% |
| Monday | 85°F | Showers And Thunderstorms Likely | 3 to 8 mph NNE | 64% |
| Monday Night | 60°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 to 8 mph NNE | 64% |
| Tuesday | 75°F | Slight Chance Showers And Thunderstorms | 7 to 10 mph N | 18% |
| Tuesday Night | 55°F | Partly Cloudy | 5 to 10 mph N | 9% |
| Wednesday | 75°F | Mostly Sunny | 6 to 9 mph N | 1% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 7 mph N | 1% |
| Thursday | 76°F | Mostly Sunny | 3 to 8 mph N | 3% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 6 mph NNE | 3% |
| Friday | 78°F | Mostly Sunny | 3 to 8 mph NNE | 3% |
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
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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 Sep 19, 2026.