Gilson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gilson, a community in Knox County, Illinois.
This Afternoon
68°F
Light Rain
Rain and a slight chance of thunderstorms. Cloudy, with a high near 68. South southeast wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Gilson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Light Rain | 18 mph SSE | 90% |
| Tonight | 52°F | Light Rain | 12 to 17 mph S | 77% |
| Wednesday | 57°F | Slight Chance Light Rain then Mostly Cloudy | 14 to 17 mph SW | 20% |
| Wednesday Night | 45°F | Mostly Cloudy | 9 to 13 mph SW | 7% |
| Thursday | 57°F | Mostly Cloudy then Slight Chance Light Rain | 8 to 14 mph WSW | 21% |
| Thursday Night | 42°F | Chance Light Rain | 3 to 8 mph NW | 29% |
| Friday | 53°F | Slight Chance Light Rain | 7 to 10 mph N | 15% |
| Friday Night | 35°F | Partly Cloudy | 0 to 6 mph N | 1% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 3% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph WNW | 3% |
| Sunday | 59°F | Sunny | 2 to 8 mph WNW | 11% |
| Sunday Night | 35°F | Mostly Clear | 5 mph W | 3% |
| Monday | 63°F | Sunny | 2 to 12 mph SW | 1% |
| Monday Night | 40°F | Mostly Clear | 6 mph W | 0% |
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 Nov 3, 2026.