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
4:35 PM CDT AUG 8, 2026
Clear
82°F
Feels Like: 84°F
Dewpoint: 64°F
Rel. Hum.: 55%
Visibility: 10 miles
Wind: NW at 3 mph
Pressure: 30.02 inches
Last 72 hours

Local Area Snow Depth

Illinois Current Weather

Illinois MOS Forecast Weather


Regional Weather Maps

(Automated weather data from NWS/FAA)
  61540 WEATHER FORECAST
10-Day model forecast maps
2026 Hurricanes

LACON, IL 61540
Weather Forecast

 Snowfall Forecast pages
Snow Depth pages
THIS AFTERNOON
Sunny. Near steady temperature in the lower 80s. Northwest winds around 5 mph.
TONIGHT
Mostly clear. Lows in the mid 60s. Light and variable winds, becoming southeast around 5 mph after midnight.
SUNDAY
Partly sunny with a chance of showers and thunderstorms. Humid with highs in the upper 80s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 30 percent.
SUNDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Humid with lows in the lower 70s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 50 percent.
MONDAY
Partly sunny with a chance of showers and thunderstorms. Humid with highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 100 in the afternoon.
MONDAY NIGHT
Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent.
TUESDAY
Partly sunny with a chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 50 percent.
TUESDAY NIGHT
Partly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows around 70. Chance of rain 70 percent.
WEDNESDAY
Partly sunny in the morning, then becoming mostly cloudy. A chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.
WEDNESDAY NIGHT
Partly cloudy with a chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 40 percent.
THURSDAY
Partly sunny in the morning, then becoming mostly cloudy. A chance of showers. A chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 40 percent.
THURSDAY NIGHT AND FRIDAY
Mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 60s. Highs in the mid 70s. Chance of rain 50 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  7:00 AM CDT  8/ 8/2026
Saturday
8 AUG 2026		 LACON, IL 61540 weather forecast Day 1, 12 hours 1 PM 80° 81° Clear 0%

 0% Thunder
( 7% severe)		 NW   5 54% 62°
High 83° LACON, IL 61540 weather forecast Day 1, 15 hours 4 PM 82° 83° Clear NW   2 49% 61°
Clear



 LACON, IL 61540 weather forecast Day 1, 18 hours 7 PM 80° 82° Clear 0%

 0% Thunder
( 7% severe)		   CALM 58% 64°
LACON, IL 61540 weather forecast Day 1, 21 hours 10 PM 70° 70° Clear   CALM 78% 63°
Sunday
9 AUG 2026		 LACON, IL 61540 weather forecast Day 2, 0 hours 1 AM 67° 67° Clear 5%

 0% Thunder
( 14% severe)		   CALM 84% 62°
Low 64° LACON, IL 61540 weather forecast Day 2, 3 hours 4 AM 66° 66° Partly Cloudy   CALM 87% 62°
High 88° LACON, IL 61540 weather forecast Day 2, 6 hours 7 AM 68° 68° Partly Cloudy 14%
RAIN
<.01 in		 0% Thunder
( 24% severe)		 S   5 90% 65°

Partly Cloudy



 LACON, IL 61540 weather forecast Day 2, 9 hours 10 AM 78° 80° Partly Cloudy S   8 74% 69°
LACON, IL 61540 weather forecast Day 2, 12 hours 1 PM 84° 90° Mostly Cloudy 13%
RAIN
<.01 in		 0% Thunder
( 37% severe)		 S   10 67% 72°
LACON, IL 61540 weather forecast Day 2, 15 hours 4 PM 87° 93° Partly Cloudy S   12 61% 72°
LACON, IL 61540 weather forecast Day 2, 18 hours 7 PM 84° 90° Partly Cloudy 33%
RAIN
***		 0% Thunder
( 28% severe)		 SSW   10 70% 73°
LACON, IL 61540 weather forecast Day 2, 21 hours 10 PM 79° 82° Partly Cloudy S   10 77% 71°
Monday
10 AUG 2026		 LACON, IL 61540 weather forecast Day 3, 0 hours 1 AM 77° 79° Partly Cloudy 32%
RAIN
1–2 in		 0% Thunder
( 19% severe)		 SSW   8 82% 71°
Low 73° LACON, IL 61540 weather forecast Day 3, 3 hours 4 AM 75° 75° Mostly Cloudy SSW   7 84% 70°
High 88° LACON, IL 61540 weather forecast Day 3, 6 hours 7 AM 74° 74° Partly Cloudy 18%
RAIN
<.01 in		 0% Thunder
( 21% severe)		 SSW   5 87% 70°

Mostly Cloudy



 LACON, IL 61540 weather forecast Day 3, 9 hours 10 AM 80° 84° Partly Cloudy S   8 77% 72°
LACON, IL 61540 weather forecast Day 3, 15 hours 1 PM 84° 90° Mostly Cloudy 17%
RAIN
<.01 in		 0% Thunder
( 32% severe)		 SSW   9 70% 73°
LACON, IL 61540 weather forecast Day 3, 18 hours 4 PM 87° 94° Mostly Cloudy WSW   9 63% 73°
LACON, IL 61540 weather forecast Day 3, 21 hours 7 PM 85° 93° Partly Cloudy     SSW   7 70% 74°

LACON/MARSHALL CNTY, IL extended weather forecast
Tuesday
11 AUG 2026		 Wednesday
12 AUG 2026		 Thursday
13 AUG 2026		 Friday
14 AUG 2026		 Saturday
15 AUG 2026
Low 74° Low 66° Low 67° Low 62° Low 60°
High 90° High 85° High 82° High 81° High 82°
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
39% Rain		 Mostly Cloudy
30% Rain		 Overcast
58% Rain		 Partly Cloudy
30% Rain		 Mostly Cloudy
30% Rain
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