Hennepin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hennepin, a village in Putnam County, Illinois.
This Afternoon
75°F
Slight Chance Rain Showers
A slight chance of rain showers before 4pm. Mostly sunny, with a high near 75. East wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for Hennepin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Slight Chance Rain Showers | 10 mph E | 20% |
| Tonight | 66°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph E | 33% |
| Saturday | 83°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph SE | 58% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph N | 76% |
| Sunday | 74°F | Rain Showers | 5 to 15 mph NE | 78% |
| Sunday Night | 57°F | Showers And Thunderstorms | 10 to 15 mph NE | 78% |
| Monday | 66°F | Showers And Thunderstorms Likely | 15 mph NE | 63% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 42% |
| Tuesday | 65°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 15 mph NE | 6% |
| Wednesday | 68°F | Partly Sunny | 5 to 10 mph NE | 5% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 10 mph NE | 5% |
| Thursday | 71°F | Mostly Sunny | 0 to 5 mph N | 3% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 4% |
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 Sep 19, 2026.