Lacon, IL Weather & Growing Conditions
Overnight
56°F
Slight Chance Light Rain
A slight chance of rain. Mostly cloudy, with a low around 56. South southwest wind around 12 mph, with gusts as high as 23 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Slight Chance Light Rain | 12 mph SSW | 19% |
| Wednesday | 59°F | Slight Chance Light Rain then Patchy Drizzle | 14 mph SW | 21% |
| Wednesday Night | 46°F | Patchy Drizzle then Cloudy | 13 mph SW | 10% |
| Thursday | 55°F | Cloudy then Chance Light Rain | 10 to 14 mph W | 28% |
| Thursday Night | 42°F | Chance Light Rain | 8 mph NW | 35% |
| Friday | 51°F | Partly Sunny | 7 to 10 mph N | 3% |
| Friday Night | 33°F | Partly Cloudy | 1 to 6 mph NNW | 0% |
| Saturday | 52°F | Sunny | 1 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 2 mph W | 2% |
| Sunday | 57°F | Sunny | 2 to 7 mph W | 2% |
| Sunday Night | 34°F | Clear | 3 mph WSW | 1% |
| Monday | 62°F | Sunny | 1 to 8 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 2 to 6 mph WSW | 0% |
| Tuesday | 63°F | Sunny | 5 mph WNW | 1% |
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.