Grand Tower, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Tower, a city in Jackson County, Illinois.
Today
88°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny. High near 88, with temperatures falling to around 86 in the afternoon. North northeast wind around 2 mph.
7-day forecast for Grand Tower
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Patchy Fog then Sunny | 2 mph NNE | 0% |
| Tonight | 65°F | Mostly Clear | 2 mph ESE | 0% |
| Wednesday | 90°F | Sunny | 2 mph S | 0% |
| Wednesday Night | 69°F | Partly Cloudy | 3 mph S | 6% |
| Thursday | 89°F | Chance Showers And Thunderstorms | 2 to 6 mph S | 30% |
| Thursday Night | 70°F | Slight Chance Showers And Thunderstorms | 1 to 5 mph S | 59% |
| Friday | 89°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph SSW | 59% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph SSW | 38% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 3 mph SSW | 38% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph S | 16% |
| Sunday | 91°F | Sunny | 3 to 8 mph SSW | 7% |
| Sunday Night | 72°F | Mostly Clear | 7 mph SSW | 3% |
| Monday | 93°F | Sunny | 5 to 8 mph SSW | 6% |
| Monday Night | 73°F | Mostly Clear | 5 to 8 mph SSW | 4% |
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 Aug 4, 2026.