LACON, IL 61540 Weather Forecast & Current Conditions

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LACON/MARSHALL CNTY, IL
Current Weather

6:35 PM CDT MAR 23, 2026
Clear
45°F
Feels Like: 44°F
Dewpoint: 14°F
Rel. Hum.: 26%
Visibility: 10 miles
Wind: ENE at 3 mph
Pressure: 30.41 inches
Last 72 hours

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LACON, IL 61540
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Partly cloudy this evening, then becoming mostly cloudy. Lows around 30. East winds 5 to 10 mph, becoming southeast after midnight.
TUESDAY
Partly sunny. Highs in the mid 50s. South winds 5 to 10 mph.
TUESDAY NIGHT
Mostly cloudy. Not as cool with lows in the lower 40s. South winds 5 to 10 mph.
WEDNESDAY
Partly sunny. Not as cool with highs in the lower 70s. South winds 10 to 15 mph with gusts up to 25 mph.
WEDNESDAY NIGHT
Mostly cloudy in the evening, then becoming partly cloudy. Not as cool with lows in the mid 50s. South winds 5 to 10 mph.
THURSDAY
Mostly sunny in the morning, then mostly cloudy with a chance of showers and thunderstorms in the afternoon. Warmer with highs in the lower 80s. Chance of rain 40 percent.
THURSDAY NIGHT
Mostly cloudy. A chance of rain showers in the evening. Breezy and much cooler with lows in the mid 30s. Chance of rain 50 percent.
FRIDAY
Mostly cloudy in the morning, then becoming mostly sunny. Much cooler with highs in the upper 40s.
FRIDAY NIGHT
Mostly clear. Lows in the upper 20s.
SATURDAY
Sunny. Highs in the mid 50s.
SATURDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 30s.
SUNDAY
Partly sunny. Highs in the lower 60s.
SUNDAY NIGHT
Partly cloudy. Lows in the lower 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  6:00 AM CST  3/23/2026
Monday
23 MAR 2026
LACON, IL 61540 weather forecast Day 1, 12 hours 12 PM 43° 38° Partly Cloudy 0%

0% Thunder
( 0% severe)
N   8 36% 19°
High 48° LACON, IL 61540 weather forecast Day 1, 15 hours 3 PM 47° 44° Partly Cloudy N   6 28% 17°
Partly Cloudy



LACON, IL 61540 weather forecast Day 1, 18 hours 6 PM 43° 42° Partly Cloudy 1%

0% Thunder
( 0% severe)
ENE   2 35% 18°
LACON, IL 61540 weather forecast Day 1, 21 hours 9 PM 37° 35° Mostly Cloudy E   2 48% 20°
Tuesday
24 MAR 2026
LACON, IL 61540 weather forecast Day 2, 0 hours 12 AM 34° 30° Mostly Cloudy 1%

0% Thunder
( 0% severe)
SE   5 52% 19°
Low 30° LACON, IL 61540 weather forecast Day 2, 3 hours 3 AM 32° 29° Mostly Cloudy SSE   3 53% 18°
High 57° LACON, IL 61540 weather forecast Day 2, 6 hours 6 AM 30° 26° Partly Cloudy 2%

0% Thunder
( 0% severe)
SSE   3 55% 17°

Mostly Cloudy



LACON, IL 61540 weather forecast Day 2, 9 hours 9 AM 41° 36° Partly Cloudy S   7 41% 20°
LACON, IL 61540 weather forecast Day 2, 12 hours 12 PM 50° 47° Mostly Cloudy 2%

0% Thunder
( 0% severe)
S   8 31% 21°
LACON, IL 61540 weather forecast Day 2, 15 hours 3 PM 56° 54° Mostly Cloudy S   7 25% 21°
LACON, IL 61540 weather forecast Day 2, 18 hours 6 PM 51° 50° Mostly Cloudy 2%

0% Thunder
( 1% severe)
SSE   3 36% 25°
LACON, IL 61540 weather forecast Day 2, 21 hours 9 PM 46° 44° Mostly Cloudy SSE   5 43% 25°
Wednesday
25 MAR 2026
LACON, IL 61540 weather forecast Day 3, 0 hours 12 AM 44° 41° Mostly Cloudy 0%

0% Thunder
( 2% severe)
S   6 51% 27°
Low 42° LACON, IL 61540 weather forecast Day 3, 3 hours 3 AM 43° 39° Mostly Cloudy S   6 57% 29°
High 71° LACON, IL 61540 weather forecast Day 3, 6 hours 6 AM 42° 38° Mostly Cloudy 0%

0% Thunder
( 2% severe)
S   6 62% 30°

Mostly Cloudy



LACON, IL 61540 weather forecast Day 3, 9 hours 9 AM 54° 51° Mostly Cloudy S   9 47% 34°
LACON, IL 61540 weather forecast Day 3, 15 hours 12 PM 65° 65° Mostly Cloudy 2%

0% Thunder
( 1% severe)
SSW   10 35% 37°
LACON, IL 61540 weather forecast Day 3, 18 hours 3 PM 70° 70° Mostly Cloudy SSW   10 35% 41°
LACON, IL 61540 weather forecast Day 3, 21 hours 6 PM 65° 65° Mostly Cloudy     SSW   6 48% 45°

LACON/MARSHALL CNTY, IL extended weather forecast

Thursday
26 MAR 2026
Friday
27 MAR 2026
Saturday
28 MAR 2026
Sunday
29 MAR 2026
Monday
30 MAR 2026
Low 55° Low 36° Low 27° Low 35° Low 35°
High 70° High 47° High 55° High 56° High 56°
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
56% Rain
Mostly Cloudy
56% Rain/Snow
Clear
2% Rain/Snow
Partly Cloudy
12% Rain
Overcast
34% Rain
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