Harman US

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

WhenTempForecastWindPrecip
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.