Grand Tower, IL Weather & Growing Conditions
Today
88°F
Sunny
Sunny. High near 88, with temperatures falling to around 86 in the afternoon. East northeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 2 mph ENE | 0% |
| Tonight | 66°F | Mostly Clear | 2 mph E | 0% |
| Wednesday | 90°F | Sunny | 2 mph S | 0% |
| Wednesday Night | 70°F | Partly Cloudy | 3 mph S | 3% |
| Thursday | 90°F | Chance Showers And Thunderstorms | 2 to 7 mph SSW | 26% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 1 to 5 mph S | 58% |
| Friday | 89°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph SSW | 58% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 2 mph SSW | 40% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 3 mph SSW | 37% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph S | 18% |
| Sunday | 91°F | Sunny | 2 to 8 mph SSW | 8% |
| Sunday Night | 73°F | Mostly Clear | 3 to 7 mph SSW | 4% |
| Monday | 93°F | Sunny | 3 to 8 mph SSW | 6% |
| Monday Night | 74°F | Mostly Clear | 7 mph SSW | 4% |
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 Aug 4, 2026.