Tennessee, IL Weather & Growing Conditions
This Afternoon
85°F
Mostly Cloudy
Mostly cloudy, with a high near 85. Southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 85°F | Mostly Cloudy | 5 mph SW | 7% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 58% |
| Sunday | 76°F | Showers And Thunderstorms Likely | 0 to 15 mph N | 61% |
| Sunday Night | 60°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 15 mph NE | 70% |
| Monday | 66°F | Showers And Thunderstorms | 10 to 15 mph NE | 75% |
| Monday Night | 55°F | Rain Showers Likely | 10 mph NE | 72% |
| Tuesday | 64°F | Chance Rain Showers | 10 mph NE | 37% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 3% |
| Wednesday | 66°F | Partly Sunny | 5 to 10 mph N | 1% |
| Wednesday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 70°F | Partly Sunny | 0 to 5 mph NE | 2% |
| Thursday Night | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph NE | 15% |
| Friday | 74°F | Slight Chance Rain Showers | 0 to 5 mph NE | 15% |
| Friday Night | 57°F | Partly Cloudy | 0 to 5 mph NE | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Tennessee, IL
Last spring frost
Apr 13
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
6a
Explore more for Tennessee, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Bentley, Il (11.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.