Hennepin, IL Weather & Growing Conditions
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 mph S | 1% |
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph S | 30% |
| Wednesday | 81°F | Chance Showers And Thunderstorms | 5 mph SW | 53% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 0 to 5 mph N | 86% |
| Thursday | 79°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 65% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 30% |
| Friday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 mph | 15% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 mph | 15% |
| Saturday | 85°F | Mostly Sunny | 5 mph SW | 8% |
| Saturday Night | 71°F | Mostly Clear | 5 to 10 mph S | 8% |
| Sunday | 87°F | Sunny | 10 mph SW | 9% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 29% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 29% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph SW | 36% |
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 Aug 4, 2026.