Gilson, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gilson, a community in Knox County, Illinois.
Today
88°F
Mostly Sunny
Mostly sunny, with a high near 88. South southwest wind around 7 mph.
7-day forecast for Gilson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny | 7 mph SSW | 0% |
| Tonight | 67°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSE | 40% |
| Wednesday | 82°F | Chance Showers And Thunderstorms | 5 mph SSW | 66% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 5 mph N | 84% |
| Thursday | 81°F | Showers And Thunderstorms Likely | 3 mph NE | 69% |
| Thursday Night | 63°F | Partly Cloudy | 2 mph ENE | 9% |
| Friday | 83°F | Mostly Sunny | 1 mph S | 14% |
| Friday Night | 65°F | Mostly Clear | 1 mph S | 14% |
| Saturday | 86°F | Sunny | 2 to 6 mph SSW | 11% |
| Saturday Night | 70°F | Mostly Clear | 3 to 7 mph S | 9% |
| Sunday | 87°F | Sunny | 7 to 12 mph SSW | 7% |
| Sunday Night | 70°F | Partly Cloudy then Chance Showers And Thunderstorms | 6 to 10 mph SSW | 28% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 6 to 10 mph SSW | 28% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 29% |
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 Aug 4, 2026.