Gilson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gilson, a community in Knox County, Illinois.
This Afternoon
78°F
Chance Rain Showers
A chance of rain showers before 4pm. Partly sunny, with a high near 78. East wind around 9 mph, with gusts as high as 16 mph. Chance of precipitation is 30%.
7-day forecast for Gilson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Chance Rain Showers | 9 mph E | 32% |
| Tonight | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 9 mph ESE | 25% |
| Saturday | 85°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 9 mph S | 32% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 7 mph NNE | 70% |
| Sunday | 75°F | Showers And Thunderstorms Likely | 5 to 13 mph NNE | 74% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 10 to 14 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 | 4% |
| 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 | 2 to 6 mph NNE | 4% |
| Thursday Night | 54°F | Partly Cloudy | 3 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Gilson (40.863, -90.199). Updated through the day.
Growing snapshot for Gilson
Last spring frost
Apr 21
First fall frost
Oct 20
Growing season
181 days
Hardiness zone
5b
More local growing data for Gilson: nearby ZIP 61436 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Abingdon
Altona
East Galesburg
Galesburg
Henderson
Knoxville
Maquon
Nekoma
Oak Run
Oneida
Rio
St. Augustine
Victoria
Wataga
Williamsfield
Yates City
Climate data from the nearest NOAA station, Knoxville, Il (4.5 mi from Gilson). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.