LACON, IL 61540 Weather Forecast & Current Conditions
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  61540 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)
 CURRENT WEATHER

LACON/MARSHALL CNTY, IL
Current Weather
8:35 AM CST MAR 5, 2026
Overcast
Fog
41°F
Feels Like: 41°F
Dewpoint: 39°F
Rel. Hum.: 93%
Visibility: 1/4 miles
Wind: Calm
Pressure: 29.99 inches
Last 72 hours

Local Area Snow Depth

Illinois Current Weather

Illinois MOS Forecast Weather


Weather Map

(Automated weather data from NWS/FAA)
  61540 WEATHER FORECAST
10-Day model forecast maps
2025 Hurricanes

LACON, IL 61540
Weather Forecast

 Snowfall Forecast pages
Snow Depth pages
REST OF TODAY
Cloudy. A chance of showers early this morning. Widespread fog early this morning, then patchy fog this afternoon. Highs in the upper 50s. North winds around 5 mph. Chance of rain 50 percent.
TONIGHT
Cloudy. Widespread fog. A chance of showers after midnight. Lows in the upper 40s. Southeast winds 5 to 10 mph. Chance of rain 30 percent.
FRIDAY
Patchy fog in the morning. Cloudy with showers likely with a chance of thunderstorms in the morning, then partly sunny with a chance of showers in the afternoon. Not as cool with highs in the mid 70s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 70 percent.
FRIDAY NIGHT
A chance of thunderstorms. A chance of showers in the evening, then showers after midnight. Lows in the mid 50s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain near 100 percent.
SATURDAY
Mostly cloudy with a chance of showers in the morning, then mostly sunny in the afternoon. Much cooler with highs around 60. Temperature falling to around 50 in the afternoon. West winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 30 percent.
SATURDAY NIGHT
Partly cloudy in the evening, then becoming mostly clear. Much cooler with lows in the mid 30s.
SUNDAY AND SUNDAY NIGHT
Clear. Highs in the lower 60s. Lows in the mid 40s.
MONDAY
Sunny. Not as cool with highs in the lower 70s.
MONDAY NIGHT
Mostly clear in the evening, then partly cloudy with a chance of showers after midnight. Lows in the mid 50s. Chance of rain 30 percent.
TUESDAY
Partly sunny in the morning, then becoming mostly cloudy. A chance of showers in the morning, then showers in the afternoon. Highs in the lower 70s. Chance of rain 80 percent.
TUESDAY NIGHT
Showers, cooler with lows in the lower 40s. Chance of rain 90 percent.
WEDNESDAY
Mostly cloudy. Showers likely, mainly in the morning. Much cooler with highs in the mid 50s. Chance of rain 60 percent.

  61540 WEATHER SATELLITE LOOPS
Visible Weather Satellite
LACON, IL 61540
Infrared Weather Satellite
LACON, IL 61540
  61540 WEATHER RADAR LOOP
NEXRAD Weather Radar
LACON, IL 61540
 MOS COMPUTER WEATHER FORECAST

LACON/MARSHALL CNTY, IL 3 hourly weather forecast
weather forecast created  6:00 PM CST  3/ 4/2026
Thursday
5 MAR 2026		 LACON, IL 61540 weather forecast Day 1, 0 hours 12 AM 43° 42° Mostly Cloudy 59%
RAIN
***		 0% Thunder
( 12% severe)		 NE   1 93% 41°
Low 42° LACON, IL 61540 weather forecast Day 1, 3 hours 3 AM 43° 42° Mostly Cloudy NE   1 93% 41°
High 56° LACON, IL 61540 weather forecast Day 1, 6 hours 6 AM 43° 42° Mostly Cloudy 62%
RAIN
.5–1 in		 0% Thunder
( 7% severe)		 NNE   2 93% 41°

Mostly Cloudy

Rain Likely

 LACON, IL 61540 weather forecast Day 1, 9 hours 9 AM 46° 45° Mostly Cloudy NNE   2 93% 44°
LACON, IL 61540 weather forecast Day 1, 12 hours 12 PM 51° 50° Mostly Cloudy 18%
RAIN
.01–.1 in		 0% Thunder
( 1% severe)		 N   5 83% 46°
LACON, IL 61540 weather forecast Day 1, 15 hours 3 PM 55° 55° Mostly Cloudy NW   3 72% 46°
LACON, IL 61540 weather forecast Day 1, 18 hours 6 PM 51° 51° Mostly Cloudy 4%

 0% Thunder
( 0% severe)		 E   1 83% 46°
LACON, IL 61540 weather forecast Day 1, 21 hours 9 PM 49° 49° Mostly Cloudy SE   1 86% 45°
Friday
6 MAR 2026		 LACON, IL 61540 weather forecast Day 2, 0 hours 12 AM 47° 46° Mostly Cloudy 26%
RAIN
<.01 in		 0% Thunder
( 18% severe)		 SE   1 86% 43°
Low 44° LACON, IL 61540 weather forecast Day 2, 3 hours 3 AM 46° 45° Mostly Cloudy SE   3 93% 44°
High 74° LACON, IL 61540 weather forecast Day 2, 6 hours 6 AM 50° 48° Mostly Cloudy 68%
RAIN
***		 0% Thunder
( 26% severe)		 SE   6 89% 47°

Mostly Cloudy

Rain Likely

 LACON, IL 61540 weather forecast Day 2, 9 hours 9 AM 58° 56° Mostly Cloudy S   12 87% 54°
LACON, IL 61540 weather forecast Day 2, 12 hours 12 PM 69° 69° Mostly Cloudy 36%
RAIN
.25–.5 in		 0% Thunder
( 13% severe)		 S   15 68% 58°
LACON, IL 61540 weather forecast Day 2, 15 hours 3 PM 72° 72° Mostly Cloudy S   15 59% 57°
LACON, IL 61540 weather forecast Day 2, 18 hours 6 PM 67° 67° Mostly Cloudy 47%
RAIN
***		 0% Thunder
( 24% severe)		 S   12 70% 57°
LACON, IL 61540 weather forecast Day 2, 21 hours 9 PM 65° 65° Mostly Cloudy S   13 75% 57°

LACON/MARSHALL CNTY, IL extended weather forecast
Saturday
7 MAR 2026		 Sunday
8 MAR 2026		 Monday
9 MAR 2026		 Tuesday
10 MAR 2026		 Wednesday
11 MAR 2026
Low 55° Low 35° Low 45° Low 49° Low 50°
High 60° High 61° High 65° High 66° High 61°
LACON, IL 61540 weather forecast Day 3 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
Mostly Cloudy
71% Rain		 Clear
6% Rain		 Clear
5% Rain		 Mostly Cloudy
42% Rain		 Overcast
69% Rain
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