Karnak, IL Weather & Growing Conditions
Tonight
56°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 2am, then a slight chance of showers and thunderstorms between 2am and 3am. Mostly cloudy. Low around 56, with temperatures rising to around 59 overnight. South southwest wind around 8 mph. Chance of precipitation is 70%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Showers And Thunderstorms Likely | 8 mph SSW | 69% |
| Wednesday | 69°F | Partly Sunny | 3 to 9 mph WSW | 7% |
| Wednesday Night | 42°F | Partly Cloudy | 2 mph WSW | 0% |
| Thursday | 69°F | Sunny | 0 to 6 mph SW | 0% |
| Thursday Night | 43°F | Partly Cloudy | 1 mph NW | 4% |
| Friday | 63°F | Partly Sunny | 1 to 8 mph NNW | 2% |
| Friday Night | 38°F | Partly Cloudy | 1 to 5 mph NNW | 1% |
| Saturday | 59°F | Mostly Sunny | 1 to 5 mph N | 0% |
| Saturday Night | 33°F | Partly Cloudy | 0 mph | 1% |
| Sunday | 62°F | Sunny | 0 to 5 mph WNW | 5% |
| Sunday Night | 33°F | Mostly Clear | 2 mph NW | 6% |
| Monday | 65°F | Sunny | 1 to 6 mph W | 1% |
| Monday Night | 35°F | Mostly Clear | 2 mph W | 0% |
| Tuesday | 69°F | Sunny | 0 to 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Karnak, IL
Last spring frost
Apr 3
First fall frost
Nov 5
Growing season
216 days
Hardiness zone
7a
Explore more for Karnak, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Grand Chain Dam 53, Il (8.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.