Hennepin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hennepin, a village in Putnam County, Illinois.
Overnight
66°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 1am and 4am, then patchy fog and a chance of showers and thunderstorms. Partly cloudy, with a low around 66. Southeast wind around 5 mph. Chance of precipitation is 40%.
7-day forecast for Hennepin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 37% |
| Saturday | 82°F | Patchy Fog | 5 to 10 mph SE | 75% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph W | 85% |
| Sunday | 73°F | Patchy Fog | 5 to 15 mph NE | 86% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 47% |
| Monday | 66°F | Rain Showers Likely | 15 mph NE | 64% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Tuesday | 64°F | Slight Chance Rain Showers | 10 to 15 mph NE | 21% |
| Tuesday Night | 50°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 15 mph NE | 17% |
| Wednesday | 68°F | Mostly Sunny | 5 to 10 mph NE | 3% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 70°F | Partly Sunny | 5 mph NE | 4% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 73°F | Mostly Sunny | 5 mph NE | 3% |
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.