Tennessee, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Tennessee, a village in Mcdonough County, Illinois.
Tonight
51°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 1am. Mostly cloudy. Low around 51, with temperatures rising to around 53 overnight. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
7-day forecast for Tennessee
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Showers And Thunderstorms Likely | 10 to 15 mph S | 58% |
| Wednesday | 56°F | Mostly Cloudy | 15 mph SW | 14% |
| Wednesday Night | 43°F | Mostly Cloudy | 10 mph SW | 3% |
| Thursday | 56°F | Partly Sunny | 10 to 15 mph W | 12% |
| Thursday Night | 42°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph NW | 26% |
| Friday | 53°F | Mostly Cloudy | 5 to 10 mph N | 11% |
| Friday Night | 36°F | Mostly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph NW | 1% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 59°F | Sunny | 5 to 10 mph W | 10% |
| Sunday Night | 36°F | Mostly Clear | 5 mph W | 4% |
| Monday | 64°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 65°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Tennessee (40.411, -90.836). Updated through the day.
Growing snapshot for Tennessee
Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
6a
More local growing data for Tennessee: nearby ZIP 62326 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Adair
Bardolph
Blandinsville
Bushnell
Colchester
Georgetown
Good Hope
Industry
Macomb
Prairie City
Sciota
Climate data from the nearest NOAA station, La Harpe, Il (13.8 mi from Tennessee). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.