DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

10:54 PM CST JAN 20, 2026
Clear
28°F
Feels Like: 15°F
Dewpoint: 10°F
Rel. Hum.: 42%
Visibility: 10 miles
Wind: SSW at 20 mph, gusts to 28
Pressure: 30.16 inches
Last 72 hours

Local Area Snow Depth

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DECATUR, IL 62521
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
REST OF TONIGHT
Mostly cloudy and not as cool. Near steady temperature in the upper 20s. South winds around 15 mph with gusts up to 25 mph.
WEDNESDAY
Partly sunny in the morning, then clearing. Highs in the upper 30s. West winds 10 to 15 mph with gusts up to 25 mph.
WEDNESDAY NIGHT
Partly cloudy. Lows around 19. West winds 10 to 15 mph, becoming northwest after midnight.
THURSDAY
Mostly sunny in the morning, then becoming mostly cloudy. Highs around 30. Northwest winds 5 to 10 mph.
THURSDAY NIGHT
Mostly cloudy. Much colder with lows around 2 above. Northwest winds 10 to 15 mph. Wind chill values as low as 12 below after midnight.
FRIDAY AND FRIDAY NIGHT
Mostly cloudy. Highs 5 to 10 above. Lows around zero. Wind chill values as low as 20 below.
SATURDAY AND SATURDAY NIGHT
Mostly cloudy with a 30 percent chance of snow. Highs around 10 above. Lows around 5 above. Wind chill values as low as 20 below.
SUNDAY
Partly sunny. Highs around 20. Wind chill values as low as 10 below in the morning.
SUNDAY NIGHT AND MONDAY
Partly cloudy. Lows zero to 5 above zero. Highs around 20. Wind chill values as low as 10 below.
MONDAY NIGHT AND TUESDAY
Partly cloudy. Lows around 10 above. Highs in the upper 20s. Wind chill values as low as 5 below.

Visible Weather Satellite
DECATUR, IL 62521
Infrared Weather Satellite
DECATUR, IL 62521
NEXRAD Weather Radar
DECATUR, IL 62521

DECATUR, IL 3 hourly weather forecast

weather forecast created  7:00 PM EST  1/20/2026
Wednesday
21 JAN 2026
DECATUR, IL 62521 weather forecast Day 1, 0 hours 12 AM 27° 15° Mostly Cloudy 7%

0% Thunder
( 0% severe)
S   16 44% 10°
Low 26° DECATUR, IL 62521 weather forecast Day 1, 3 hours 3 AM 29° 17° Mostly Cloudy SSW   16 47% 13°
High 39° DECATUR, IL 62521 weather forecast Day 1, 6 hours 6 AM 30° 19° Mostly Cloudy 4%

0% Thunder
( 0% severe)
SW   16 55% 17°

Decreasing Clouds




Breezy
DECATUR, IL 62521 weather forecast Day 1, 9 hours 9 AM 33° 22° Partly Cloudy WSW   16 59% 21°
DECATUR, IL 62521 weather forecast Day 1, 12 hours 12 PM 37° 28° Clear 0%

0% Thunder
( 0% severe)
W   16 53% 22°
DECATUR, IL 62521 weather forecast Day 1, 15 hours 3 PM 38° 29° Clear WSW   16 46% 20°
DECATUR, IL 62521 weather forecast Day 1, 18 hours 6 PM 33° 24° Clear 0%

0% Thunder
( 0% severe)
WSW   12 54% 19°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 9 PM 32° 22° Partly Cloudy W   15 56% 19°
Thursday
22 JAN 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 12 AM 30° 19° Partly Cloudy 0%

0% Thunder
( 0% severe)
WNW   15 58% 18°
Low 19° DECATUR, IL 62521 weather forecast Day 2, 3 hours 3 AM 25° 14° Clear WNW   13 59% 14°
High 31° DECATUR, IL 62521 weather forecast Day 2, 6 hours 6 AM 21° 10° Partly Cloudy 0%

0% Thunder
( 0% severe)
WNW   10 61% 11°

Mostly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 9 AM 23° 13° Partly Cloudy W   9 53% 10°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 12 PM 28° 19° Mostly Cloudy 0%

0% Thunder
( 0% severe)
W   10 38%
DECATUR, IL 62521 weather forecast Day 2, 15 hours 3 PM 30° 21° Mostly Cloudy W   10 35%
DECATUR, IL 62521 weather forecast Day 2, 18 hours 6 PM 26° 19° Mostly Cloudy 0%

0% Thunder
( 0% severe)
W   6 44%
DECATUR, IL 62521 weather forecast Day 2, 21 hours 9 PM 23° 15° Mostly Cloudy WNW   7 53% 10°

DECATUR, IL extended weather forecast

BAD DAY
BAD DATE
BAD DAY
BAD DATE
BAD DAY
BAD DATE
BAD DAY
BAD DATE
BAD DAY
BAD DATE
Low 22° Low -1° Low -5° Low 6° Low 14°
High 31° High 5° High 15° High 20° High 36°
DECATUR, IL 62521 weather forecast Day 3 DECATUR, IL 62521 weather forecast Day 4 DECATUR, IL 62521 weather forecast Day 5 DECATUR, IL 62521 weather forecast Day 6 DECATUR, IL 62521 weather forecast Day 7
Partly Cloudy
5% Snow
Partly Cloudy
8% Snow
Mostly Cloudy
17% Snow
Mostly Cloudy
17% Snow
Clear
11% Snow
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