Hennepin, IL Weather & Growing Conditions
Tonight
56°F
Rain Showers
Rain showers. Mostly cloudy. Low around 56, with temperatures rising to around 58 overnight. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Rain Showers | 10 to 15 mph S | 91% |
| Wednesday | 59°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph SW | 33% |
| Wednesday Night | 47°F | Mostly Cloudy | 10 to 15 mph SW | 12% |
| Thursday | 55°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph W | 36% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 10 mph NW | 36% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 4% |
| Friday Night | 34°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 56°F | Sunny | 5 mph W | 2% |
| Sunday Night | 36°F | Clear | 0 to 5 mph W | 1% |
| Monday | 62°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 1% |
| Tuesday | 63°F | Sunny | 5 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Hennepin, IL
Last spring frost
Apr 18
First fall frost
Oct 22
Growing season
188 days
Hardiness zone
5b
Explore more for Hennepin, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Hennepin, Il (2.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.