DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

10:54 PM CST JAN 4, 2026
Clear
34°F
Feels Like: 26°F
Dewpoint: 27°F
Rel. Hum.: 75%
Visibility: 10 miles
Wind: S at 10 mph
Pressure: 29.97 inches
Last 72 hours

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DECATUR, IL 62521
Weather Forecast

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REST OF TONIGHT
Mostly clear and not as cool. Near steady temperature in the lower 30s. South winds 10 to 15 mph with gusts up to 25 mph.
MONDAY
Partly sunny. Not as cool with highs around 50. Southwest winds 5 to 10 mph.
MONDAY NIGHT
Mostly cloudy. Near steady temperature in the lower 40s. South winds 5 to 10 mph.
TUESDAY
Mostly sunny. Highs in the upper 50s. West winds 10 to 15 mph.
TUESDAY NIGHT
Partly cloudy in the evening, then clearing. Lows in the lower 30s. West winds 5 to 10 mph.
WEDNESDAY
Sunny. Highs in the mid 50s.
WEDNESDAY NIGHT
Partly cloudy. Lows in the lower 40s.
THURSDAY
Mostly cloudy. A chance of rain in the morning, then rain likely in the afternoon. Highs in the mid 50s. Chance of rain 60 percent.
THURSDAY NIGHT
Mostly cloudy. Rain likely, mainly in the evening. Lows in the lower 40s. Chance of rain 70 percent.
FRIDAY
Partly sunny with a 40 percent chance of rain. Highs in the upper 40s.
FRIDAY NIGHT AND SATURDAY
Mostly cloudy. Lows around 30. Highs around 40.
SATURDAY NIGHT AND SUNDAY
Partly cloudy. Lows around 20. Highs in the mid 30s.

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/ 4/2026
Monday
5 JAN 2026
DECATUR, IL 62521 weather forecast Day 1, 0 hours 12 AM 32° 22° Clear 0%

0% Thunder
( 0% severe)
S   13 71% 24°
Low 31° DECATUR, IL 62521 weather forecast Day 1, 3 hours 3 AM 33° 24° Clear SSW   13 71% 25°
High 49° DECATUR, IL 62521 weather forecast Day 1, 6 hours 6 AM 32° 24° Partly Cloudy 0%

0% Thunder
( 0% severe)
SSW   10 81% 27°

Mostly Cloudy



DECATUR, IL 62521 weather forecast Day 1, 9 hours 9 AM 37° 30° Mostly Cloudy SW   10 79% 31°
DECATUR, IL 62521 weather forecast Day 1, 12 hours 12 PM 45° 40° Mostly Cloudy 0%

0% Thunder
( 0% severe)
SW   10 71% 36°
DECATUR, IL 62521 weather forecast Day 1, 15 hours 3 PM 49° 45° Mostly Cloudy SSW   10 63% 37°
DECATUR, IL 62521 weather forecast Day 1, 18 hours 6 PM 43° 38° Mostly Cloudy 3%

0% Thunder
( 1% severe)
SSE   8 82% 38°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 9 PM 42° 36° Mostly Cloudy SSE   9 86% 38°
Tuesday
6 JAN 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 12 AM 43° 37° Mostly Cloudy 7%

0% Thunder
( 0% severe)
S   10 89% 40°
Low 39° DECATUR, IL 62521 weather forecast Day 2, 3 hours 3 AM 44° 38° Mostly Cloudy S   12 93% 42°
High 55° DECATUR, IL 62521 weather forecast Day 2, 6 hours 6 AM 45° 39° Mostly Cloudy 1%

0% Thunder
( 0% severe)
SSW   13 93% 43°

Mostly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 9 AM 47° 41° Mostly Cloudy WSW   14 89% 44°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 12 PM 52° 47° Mostly Cloudy 0%

0% Thunder
( 0% severe)
W   15 71% 43°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 3 PM 53° 49° Partly Cloudy W   14 64% 41°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 6 PM 47° 43° Partly Cloudy 0%

0% Thunder
( 0% severe)
WNW   9 76% 40°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 9 PM 41° 36° Partly Cloudy WNW   7 86% 37°

DECATUR, IL extended weather forecast

BAD DAY
BAD DATE
BAD DAY
BAD DATE
BAD DAY
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BAD DATE
Low 41° Low 36° Low 36° Low 33° Low 26°
High 55° High 55° High 51° High 42° High 37°
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
7% Rain
Clear
8% Rain
Partly Cloudy
13% Rain
Overcast
57% Rain
Overcast
37% Rain/Snow
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