DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

3:54 AM CDT SEP 29, 2026
Clear
48°F
Feels Like: 48°F
Dewpoint: 45°F
Rel. Hum.: 89%
Visibility: 10 miles
Wind: Calm
Pressure: 30.04 inches
Last 72 hours

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DECATUR, IL 62521
Weather Forecast

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REST OF TONIGHT
Clear. Near steady temperature in the lower 50s. East winds around 5 mph.
TUESDAY
Sunny. Highs in the lower 80s. South winds 5 to 10 mph.
TUESDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Not as cool with lows in the lower 60s. South winds 5 to 10 mph.
WEDNESDAY
Mostly cloudy. Highs in the mid 80s. South winds 5 to 10 mph.
WEDNESDAY NIGHT
Mostly cloudy. Lows in the upper 60s. South winds 10 to 15 mph.
THURSDAY
Mostly cloudy. A chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.
THURSDAY NIGHT
Showers likely in the evening, then showers with a chance of thunderstorms after midnight. Lows in the mid 60s. Chance of rain 80 percent.
FRIDAY
Showers likely, mainly in the morning. Cooler with highs in the lower 70s. Chance of rain 70 percent.
FRIDAY NIGHT
Mostly cloudy with a 40 percent chance of showers. Cooler with lows in the mid 50s.
SATURDAY AND SATURDAY NIGHT
Mostly cloudy. Highs in the upper 60s. Lows in the mid 50s.
SUNDAY
Mostly sunny. Highs around 70.
SUNDAY NIGHT AND MONDAY
Mostly clear. Lows in the upper 40s. Highs in the upper 60s.

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  8:00 PM EDT  9/28/2026
Tuesday
29 SEP 2026
DECATUR, IL 62521 weather forecast Day 1, 0 hours 1 AM 55° 55° Clear 0%

0% Thunder
( 0% severe)
E   3 83% 50°
Low 51° DECATUR, IL 62521 weather forecast Day 1, 3 hours 4 AM 53° 53° Clear E   3 93% 51°
High 82° DECATUR, IL 62521 weather forecast Day 1, 6 hours 7 AM 52° 52° Clear 0%

0% Thunder
( 0% severe)
ESE   3 93% 50°

Clear



DECATUR, IL 62521 weather forecast Day 1, 9 hours 10 AM 68° 68° Clear S   7 61% 54°
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 79° 79° Clear 1%

0% Thunder
( 1% severe)
S   8 35% 49°
DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 81° 80° Partly Cloudy S   8 32% 48°
DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 72° 72° Partly Cloudy 1%

0% Thunder
( 1% severe)
SSE   6 48% 51°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 65° 65° Mostly Cloudy SSE   7 60% 51°
Wednesday
30 SEP 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 63° 63° Mostly Cloudy 3%

0% Thunder
( 1% severe)
SSE   8 60% 49°
Low 62° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 63° 62° Mostly Cloudy S   9 65% 51°
High 85° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 63° 62° Mostly Cloudy 1%

0% Thunder
( 1% severe)
S   9 65% 51°

Mostly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 73° 73° Mostly Cloudy S   12 48% 52°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 82° 81° Mostly Cloudy 2%

0% Thunder
( 2% severe)
S   13 35% 52°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 84° 83° Mostly Cloudy S   14 37% 55°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 78° 79° Mostly Cloudy 2%

0% Thunder
( 1% severe)
SSE   10 48% 57°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 72° 72° Mostly Cloudy S   12 59% 57°

DECATUR, IL extended weather forecast

Thursday
1 OCT 2026
Friday
2 OCT 2026
Saturday
3 OCT 2026
Sunday
4 OCT 2026
Monday
5 OCT 2026
Low 65° Low 60° Low 48° Low 48° Low 46°
High 85° High 69° High 71° High 74° High 70°
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
Overcast
50% Rain
Overcast
85% Rain
Partly Cloudy
17% Rain
Clear
17% Rain
Clear
13% Rain
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