Grand Tower, IL Weather & Growing Conditions
Tonight
55°F
Showers And Thunderstorms then Mostly Cloudy
Showers and thunderstorms before midnight. Mostly cloudy. Low around 55, with temperatures rising to around 58 overnight. South wind 6 to 12 mph, with gusts as high as 18 mph. Chance of precipitation is 90%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Showers And Thunderstorms then Mostly Cloudy | 6 to 12 mph S | 91% |
| Wednesday | 68°F | Partly Sunny | 3 to 8 mph WSW | 4% |
| Wednesday Night | 41°F | Mostly Clear | 3 mph SW | 0% |
| Thursday | 69°F | Sunny | 1 to 7 mph SW | 0% |
| Thursday Night | 43°F | Partly Cloudy | 3 mph WNW | 6% |
| Friday | 61°F | Partly Sunny | 3 to 9 mph NNW | 2% |
| Friday Night | 38°F | Partly Cloudy | 2 to 6 mph NNW | 1% |
| Saturday | 58°F | Mostly Sunny | 5 mph NNW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 63°F | Sunny | 0 to 5 mph WNW | 5% |
| Sunday Night | 34°F | Mostly Clear | 2 mph NW | 5% |
| Monday | 65°F | Sunny | 1 to 7 mph W | 2% |
| Monday Night | 37°F | Mostly Clear | 3 mph SW | 0% |
| Tuesday | 70°F | Sunny | 1 to 5 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grand Tower, IL
Last spring frost
Apr 8
First fall frost
Oct 29
Growing season
203 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, Anna 2 Nne, Il (12.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.