Tennessee, IL Weather & Growing Conditions
Tonight
51°F
Mostly Cloudy
Mostly cloudy. Low around 51, with temperatures rising to around 54 overnight. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Cloudy | 10 to 15 mph SW | 8% |
| Wednesday | 57°F | Mostly Cloudy | 15 to 20 mph W | 11% |
| Wednesday Night | 45°F | Mostly Cloudy | 10 mph SW | 3% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph W | 25% |
| Thursday Night | 43°F | Slight Chance Rain Showers | 5 to 10 mph NW | 24% |
| Friday | 52°F | Partly Sunny | 5 to 10 mph N | 13% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 58°F | Sunny | 5 to 10 mph W | 2% |
| Sunday Night | 36°F | Clear | 0 to 5 mph W | 0% |
| Monday | 64°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Tuesday | 65°F | Sunny | 0 to 5 mph NW | 0% |
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 Nov 4, 2026.