Gilson, IL Weather & Growing Conditions
Overnight
54°F
Slight Chance Light Rain
A slight chance of rain after 5am. Mostly cloudy, with a low around 54. South southwest wind around 12 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Light Rain | 12 mph SSW | 16% |
| Wednesday | 57°F | Patchy Drizzle | 15 mph WSW | 17% |
| Wednesday Night | 45°F | Patchy Drizzle then Cloudy | 13 mph WSW | 10% |
| Thursday | 54°F | Slight Chance Light Rain | 10 to 14 mph W | 22% |
| Thursday Night | 42°F | Slight Chance Light Rain then Mostly Cloudy | 6 to 9 mph NW | 22% |
| Friday | 51°F | Partly Sunny | 6 to 10 mph N | 9% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NNW | 0% |
| Saturday Night | 33°F | Mostly Clear | 2 mph WNW | 1% |
| Sunday | 57°F | Sunny | 2 to 7 mph W | 1% |
| Sunday Night | 34°F | Clear | 3 mph W | 1% |
| Monday | 63°F | Sunny | 1 to 8 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph WSW | 0% |
| Tuesday | 64°F | Sunny | 3 mph NW | 0% |
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 Nov 4, 2026.