Henderson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Henderson, a village in Knox County, Illinois.
Overnight
68°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms between 3am and 5am, then patchy fog and a chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Southeast wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Henderson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Chance Showers And Thunderstorms | 10 mph SE | 30% |
| Saturday | 84°F | Patchy Fog then Chance Showers And Thunderstorms | 9 mph SSE | 49% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 8 mph N | 74% |
| Sunday | 73°F | Showers And Thunderstorms Likely | 7 to 14 mph NE | 74% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 15 mph NE | 66% |
| Monday | 64°F | Showers And Thunderstorms Likely | 17 mph ENE | 65% |
| Monday Night | 53°F | Chance Rain Showers | 12 to 16 mph NE | 46% |
| Tuesday | 63°F | Chance Rain Showers | 12 to 15 mph NE | 34% |
| Tuesday Night | 49°F | Mostly Cloudy | 5 to 12 mph NNE | 5% |
| Wednesday | 67°F | Mostly Sunny | 9 mph NNE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph NE | 2% |
| Thursday | 68°F | Mostly Sunny | 6 mph NNE | 4% |
| Thursday Night | 54°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 70°F | Mostly Sunny | 3 to 7 mph NE | 5% |
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 Sep 19, 2026.