Kilbourne, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kilbourne, a village in Mason County, Illinois.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. South wind around 6 mph.
7-day forecast for Kilbourne
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 6 mph S | 0% |
| Tonight | 68°F | Partly Cloudy | 6 mph SSE | 8% |
| Wednesday | 86°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 6 mph S | 29% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph E | 86% |
| Thursday | 82°F | Showers And Thunderstorms | 3 mph S | 80% |
| Thursday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph SSE | 15% |
| Friday | 84°F | Mostly Sunny | 1 mph WSW | 7% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 1 mph SSW | 19% |
| Saturday | 87°F | Slight Chance Showers And Thunderstorms then Sunny | 1 to 5 mph SSW | 18% |
| Saturday Night | 70°F | Mostly Clear | 5 mph S | 9% |
| Sunday | 90°F | Sunny | 6 to 9 mph SSW | 5% |
| Sunday Night | 72°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 8 mph SSW | 15% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 8 mph SSW | 15% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 7 mph SSW | 27% |
Forecast source: National Weather Service (api.weather.gov) for Kilbourne (40.152, -90.012). Updated through the day.
Growing snapshot for Kilbourne
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
185 days
Hardiness zone
6a
More local growing data for Kilbourne: nearby ZIP 62655 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Havana, Il (10.1 mi from Kilbourne). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.