Hennepin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hennepin, a village in Putnam County, Illinois.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. South wind around 5 mph.
7-day forecast for Hennepin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 mph S | 1% |
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 0 to 5 mph S | 32% |
| Wednesday | 82°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 55% |
| Wednesday Night | 65°F | Showers And Thunderstorms | 0 to 5 mph NW | 86% |
| Thursday | 79°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 63% |
| Thursday Night | 63°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 29% |
| Friday | 82°F | Mostly Sunny | 0 mph | 14% |
| Friday Night | 65°F | Mostly Clear | 0 mph | 14% |
| Saturday | 85°F | Mostly Sunny | 0 to 5 mph SW | 8% |
| Saturday Night | 70°F | Mostly Clear | 5 mph S | 8% |
| Sunday | 87°F | Sunny | 5 to 10 mph SW | 9% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 30% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 30% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 36% |
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 Aug 4, 2026.