Hennepin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hennepin, a village in Putnam County, Illinois.
This Afternoon
71°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 71, with temperatures falling to around 69 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 90%.
7-day forecast for Hennepin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Showers And Thunderstorms | 15 to 20 mph S | 91% |
| Tonight | 54°F | Showers And Thunderstorms | 15 mph S | 91% |
| Wednesday | 58°F | Chance Rain Showers then Mostly Cloudy | 15 mph SW | 26% |
| Wednesday Night | 46°F | Mostly Cloudy | 10 to 15 mph SW | 11% |
| Thursday | 56°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph SW | 27% |
| Thursday Night | 43°F | Chance Rain Showers then Mostly Cloudy | 5 mph NW | 34% |
| Friday | 53°F | Slight Chance Rain Showers then Partly Sunny | 5 to 10 mph N | 18% |
| Friday Night | 35°F | Partly Cloudy | 0 to 5 mph NW | 2% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 35°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 58°F | Sunny | 0 to 5 mph W | 14% |
| Sunday Night | 36°F | Mostly Clear | 0 to 5 mph W | 3% |
| Monday | 62°F | Sunny | 0 to 10 mph SW | 2% |
| Monday Night | 40°F | Mostly Clear | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Hennepin (41.251, -89.314). Updated through the day.
Growing snapshot for Hennepin
Last spring frost
Apr 18
First fall frost
Oct 22
Growing season
188 days
Hardiness zone
5b
More local growing data for Hennepin: nearby ZIP 61327 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hennepin, Il (2.6 mi from Hennepin). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.