LACON, IL 61540 Weather Forecast & Current Conditions

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LACON/MARSHALL CNTY, IL
Current Weather

7:15 PM CDT APR 19, 2026
Clear
50°F
Feels Like: 46°F
Dewpoint: 25°F
Rel. Hum.: 37%
Visibility: 10 miles
Wind: NW at 10 mph, gusts to 18
Pressure: 30.19 inches
Last 72 hours

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LACON, IL 61540
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Mostly clear. Widespread frost after midnight. Lows in the lower 30s. Northwest winds 10 to 15 mph with gusts up to 25 mph, becoming north around 5 mph after midnight.
MONDAY
Widespread frost in the morning. Sunny. Highs in the upper 50s. East winds around 5 mph, becoming south around 5 mph in the afternoon.
MONDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Not as cool with lows in the upper 40s. South winds 10 to 15 mph with gusts up to 25 mph.
TUESDAY
Sunny. Not as cool with highs in the upper 70s. Southwest winds 15 to 20 mph with gusts up to 30 mph.
TUESDAY NIGHT
Partly cloudy in the evening, then clearing. Not as cool with lows in the upper 50s. Southwest winds 10 to 15 mph.
WEDNESDAY AND WEDNESDAY NIGHT
Mostly clear. Highs around 80. Lows in the upper 50s.
THURSDAY
Mostly sunny and breezy. Highs in the lower 80s.
THURSDAY NIGHT
Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers after midnight. Lows around 60. Chance of rain 80 percent.
FRIDAY
Mostly cloudy in the morning, then becoming partly sunny. A 50 percent chance of showers. Highs in the lower 70s.
FRIDAY NIGHT
Mostly cloudy with a chance of showers in the evening, then partly cloudy after midnight. Cooler with lows in the upper 40s. Chance of rain 40 percent.
SATURDAY THROUGH SUNDAY
Partly cloudy. Highs in the upper 60s. Lows in the mid 40s.

Visible Weather Satellite
LACON, IL 61540
Infrared Weather Satellite
LACON, IL 61540
NEXRAD Weather Radar
LACON, IL 61540

LACON/MARSHALL CNTY, IL 3 hourly weather forecast

weather forecast created  7:00 AM CDT  4/19/2026
Sunday
19 APR 2026
LACON, IL 61540 weather forecast Day 1, 12 hours 1 PM 52° 47° Mostly Cloudy 4%

0% Thunder
( 2% severe)
WNW   15 37% 27°
High 53° LACON, IL 61540 weather forecast Day 1, 15 hours 4 PM 52° 47° Partly Cloudy NW   14 36% 26°
Decreasing Clouds



LACON, IL 61540 weather forecast Day 1, 18 hours 7 PM 49° 45° Clear 0%

0% Thunder
( 0% severe)
NNW   9 35% 23°
LACON, IL 61540 weather forecast Day 1, 21 hours 10 PM 40° 37° Clear N   5 54% 25°
Monday
20 APR 2026
LACON, IL 61540 weather forecast Day 2, 0 hours 1 AM 35° 33° Clear 0%

0% Thunder
( 0% severe)
N   1 63% 24°
Low 30° LACON, IL 61540 weather forecast Day 2, 3 hours 4 AM 31° 28° Clear   CALM 71% 23°
High 60° LACON, IL 61540 weather forecast Day 2, 6 hours 7 AM 31° 28° Clear 0%

0% Thunder
( 0% severe)
  CALM 71% 23°

Clear



LACON, IL 61540 weather forecast Day 2, 9 hours 10 AM 45° 44° Partly Cloudy ESE   1 39% 22°
LACON, IL 61540 weather forecast Day 2, 12 hours 1 PM 53° 53° Clear 1%

0% Thunder
( 0% severe)
S   3 28% 21°
LACON, IL 61540 weather forecast Day 2, 15 hours 4 PM 57° 56° Clear SSW   6 26% 23°
LACON, IL 61540 weather forecast Day 2, 18 hours 7 PM 56° 55° Partly Cloudy 0%

0% Thunder
( 1% severe)
S   6 32% 27°
LACON, IL 61540 weather forecast Day 2, 21 hours 10 PM 49° 45° Partly Cloudy S   8 48% 30°
Tuesday
21 APR 2026
LACON, IL 61540 weather forecast Day 3, 0 hours 1 AM 49° 45° Partly Cloudy 0%

0% Thunder
( 2% severe)
S   9 56% 34°
Low 47° LACON, IL 61540 weather forecast Day 3, 3 hours 4 AM 49° 45° Partly Cloudy SSW   10 63% 37°
High 77° LACON, IL 61540 weather forecast Day 3, 6 hours 7 AM 51° 47° Partly Cloudy 2%

0% Thunder
( 3% severe)
SSW   10 66% 40°

Partly Cloudy



LACON, IL 61540 weather forecast Day 3, 9 hours 10 AM 62° 60° Partly Cloudy SW   13 52% 44°
LACON, IL 61540 weather forecast Day 3, 15 hours 1 PM 71° 71° Partly Cloudy 6%

0% Thunder
( 16% severe)
SW   14 42% 47°
LACON, IL 61540 weather forecast Day 3, 18 hours 4 PM 75° 75° Partly Cloudy WSW   13 40% 49°
LACON, IL 61540 weather forecast Day 3, 21 hours 7 PM 72° 72° Partly Cloudy     WSW   9 46% 50°

LACON/MARSHALL CNTY, IL extended weather forecast

Wednesday
22 APR 2026
Thursday
23 APR 2026
Friday
24 APR 2026
Saturday
25 APR 2026
Sunday
26 APR 2026
Low 53° Low 55° Low 55° Low 44° Low 44°
High 74° High 75° High 69° High 63° High 66°
LACON, IL 61540 weather forecast Day 4 LACON, IL 61540 weather forecast Day 5 LACON, IL 61540 weather forecast Day 6 LACON, IL 61540 weather forecast Day 7 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Overcast
33% Rain
Partly Cloudy
25% Rain
Overcast
66% Rain
Partly Cloudy
31% Rain
Partly Cloudy
32% Rain
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