Grand Tower, IL Weather & Growing Conditions
Today
99°F
Sunny
Sunny. High near 99, with temperatures falling to around 97 in the afternoon. Southwest wind 2 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 2 to 7 mph SW | 2% |
| Tonight | 72°F | Mostly Clear | 3 mph SSW | 1% |
| Sunday | 97°F | Mostly Sunny | 5 mph WSW | 0% |
| Sunday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 3 mph N | 29% |
| Monday | 85°F | Showers And Thunderstorms Likely | 3 to 8 mph NNE | 63% |
| Monday Night | 61°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 to 8 mph NNE | 63% |
| Tuesday | 75°F | Slight Chance Showers And Thunderstorms | 7 to 10 mph N | 18% |
| Tuesday Night | 56°F | Partly Cloudy | 5 to 10 mph N | 10% |
| Wednesday | 75°F | Mostly Sunny | 6 to 9 mph N | 1% |
| Wednesday Night | 55°F | Partly Cloudy | 2 to 7 mph N | 1% |
| Thursday | 77°F | Mostly Sunny | 2 to 8 mph N | 3% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 6 mph NNE | 3% |
| Friday | 78°F | Mostly Sunny | 2 to 8 mph NNE | 3% |
| Friday Night | 57°F | Partly Cloudy | 2 to 6 mph NNE | 2% |
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 Sep 19, 2026.