Henderson, IL Weather & Growing Conditions
Tonight
68°F
Mostly Cloudy then 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 8 to 12 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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 8 to 12 mph SE | 30% |
| Saturday | 84°F | Patchy Fog then Chance Showers And Thunderstorms | 9 mph SSE | 48% |
| 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 15 mph NE | 74% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 16 mph NE | 67% |
| Monday | 64°F | Showers And Thunderstorms Likely | 17 mph ENE | 65% |
| Monday Night | 53°F | Chance Rain Showers | 12 to 16 mph NE | 45% |
| Tuesday | 63°F | Chance Rain Showers | 12 to 15 mph NE | 34% |
| Tuesday Night | 49°F | Mostly Cloudy | 6 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). Updated through the day.
Growing snapshot for Henderson, IL
Last spring frost
Apr 20
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
Explore more for Henderson, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Galesburg, Il (6.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.