Kilbourne, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kilbourne, a village in Mason County, Illinois.
This Afternoon
71°F
Light Rain
Rain and a slight chance of thunderstorms. Mostly cloudy. High near 71, with temperatures falling to around 65 in the afternoon. South southeast wind around 17 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Kilbourne
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Light Rain | 17 mph SSE | 77% |
| Tonight | 52°F | Light Rain Likely | 10 to 16 mph S | 72% |
| Wednesday | 59°F | Chance Rain Showers then Mostly Cloudy | 12 to 15 mph SW | 10% |
| Wednesday Night | 43°F | Mostly Cloudy | 9 mph SW | 1% |
| Thursday | 60°F | Mostly Sunny | 7 to 12 mph WSW | 6% |
| Thursday Night | 41°F | Mostly Cloudy then Slight Chance Light Rain | 6 mph NW | 19% |
| Friday | 55°F | Mostly Cloudy | 6 to 9 mph NNW | 12% |
| Friday Night | 35°F | Mostly Cloudy | 1 to 7 mph N | 2% |
| Saturday | 54°F | Mostly Sunny | 3 mph NW | 2% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph W | 2% |
| Sunday | 60°F | Sunny | 2 to 7 mph W | 8% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 4% |
| Monday | 64°F | Sunny | 2 to 8 mph SW | 1% |
| Monday Night | 39°F | Mostly Clear | 6 mph WSW | 1% |
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 Nov 4, 2026.