Gilson, IL Weather & Growing Conditions
This Afternoon
78°F
Mostly Sunny
Mostly sunny, with a high near 78. East wind around 9 mph, with gusts as high as 16 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Mostly Sunny | 9 mph E | 2% |
| Tonight | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 9 mph ESE | 26% |
| Saturday | 85°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 9 mph S | 33% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 7 mph NNE | 70% |
| Sunday | 75°F | Showers And Thunderstorms Likely | 5 to 14 mph NNE | 74% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 68% |
| Monday | 66°F | Showers And Thunderstorms Likely | 13 to 16 mph ENE | 68% |
| Monday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 45% |
| Tuesday | 64°F | Chance Rain Showers | 10 to 14 mph NE | 31% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NNE | 5% |
| Wednesday | 68°F | Partly Sunny | 8 mph NNE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph NNE | 2% |
| Thursday | 69°F | Mostly Sunny | 5 mph NNE | 4% |
| Thursday Night | 54°F | Partly Cloudy | 3 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Gilson, IL
Last spring frost
Apr 21
First fall frost
Oct 20
Growing season
181 days
Hardiness zone
5b
Explore more for Gilson, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Knoxville, Il (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.