Henderson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Henderson, a village in Knox County, Illinois.
This Afternoon
67°F
Light Rain
Rain before 3pm, then rain and a slight chance of thunderstorms. Mostly cloudy, with a high near 67. South southeast wind around 20 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Henderson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Light Rain | 20 mph SSE | 90% |
| Tonight | 52°F | Light Rain | 12 to 18 mph S | 78% |
| Wednesday | 57°F | Chance Light Rain | 17 mph SW | 25% |
| Wednesday Night | 46°F | Mostly Cloudy | 14 mph SW | 8% |
| Thursday | 56°F | Chance Light Rain | 9 to 15 mph W | 25% |
| Thursday Night | 43°F | Chance Light Rain | 6 to 9 mph NW | 30% |
| Friday | 52°F | Mostly Cloudy | 7 to 12 mph N | 14% |
| Friday Night | 39°F | Partly Cloudy | 1 to 6 mph N | 3% |
| Saturday | 54°F | Partly Sunny | 1 to 5 mph NW | 2% |
| Saturday Night | 37°F | Partly Cloudy | 3 mph WSW | 4% |
| Sunday | 56°F | Mostly Sunny | 3 to 10 mph W | 9% |
| Sunday Night | 37°F | Partly Cloudy | 6 mph W | 4% |
| Monday | 59°F | Sunny | 3 to 9 mph WSW | 3% |
| Monday Night | 40°F | Mostly Clear | 5 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Henderson (41.024, -90.354). Updated through the day.
Growing snapshot for Henderson
Last spring frost
Apr 20
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
More local growing data for Henderson: nearby ZIP 61439 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Abingdon
Altona
East Galesburg
Galesburg
Gilson
Knoxville
Maquon
Nekoma
Oak Run
Oneida
Rio
St. Augustine
Victoria
Wataga
Williamsfield
Yates City
Climate data from the nearest NOAA station, Galesburg, Il (6 mi from Henderson). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.