Lacon, IL Weather & Growing Conditions
Tonight
55°F
Light Rain then Rain Showers Likely
Rain and a slight chance of thunderstorms before midnight, then rain showers likely. Mostly cloudy, with a low around 55. South wind 12 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Light Rain then Rain Showers Likely | 12 to 16 mph S | 95% |
| Wednesday | 59°F | Slight Chance Light Rain then Mostly Cloudy | 12 to 15 mph SW | 27% |
| Wednesday Night | 46°F | Mostly Cloudy | 12 mph SW | 7% |
| Thursday | 57°F | Mostly Cloudy then Slight Chance Light Rain | 8 to 13 mph WSW | 16% |
| Thursday Night | 43°F | Chance Light Rain | 3 to 7 mph NW | 29% |
| Friday | 53°F | Slight Chance Light Rain | 9 mph N | 19% |
| Friday Night | 35°F | Partly Cloudy | 1 to 7 mph NNW | 3% |
| Saturday | 52°F | Mostly Sunny | 3 mph WNW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 2 mph WSW | 3% |
| Sunday | 58°F | Sunny then Slight Chance Light Rain | 2 to 8 mph W | 15% |
| Sunday Night | 35°F | Mostly Clear | 5 mph W | 4% |
| Monday | 62°F | Sunny | 2 to 10 mph SW | 2% |
| Monday Night | 40°F | Mostly Clear | 3 to 7 mph WSW | 1% |
| Tuesday | 64°F | Sunny | 6 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lacon, IL
Last spring frost
Apr 20
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
5b
Explore more for Lacon, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lacon, Il (2.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.