DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

8:54 PM CDT SEP 17, 2025
Clear
70°F
Feels Like: 70°F
Dewpoint: 54°F
Rel. Hum.: 57%
Visibility: 10 miles
Wind: Calm
Pressure: 30.03 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
Clear. Lows in the upper 50s. East winds around 5 mph.
THURSDAY
Sunny. Highs in the lower 90s. Southeast winds around 5 mph.
THURSDAY NIGHT
Mostly clear. Lows in the lower 60s. Southeast winds around 5 mph.
FRIDAY
Mostly sunny. Highs around 90. South winds around 5 mph.
FRIDAY NIGHT
Mostly cloudy with a chance of showers. Lows in the lower 60s. Southeast winds around 5 mph. Chance of rain 30 percent.
SATURDAY AND SATURDAY NIGHT
Partly cloudy. Highs in the upper 80s. Lows in the lower 60s.
SUNDAY
Mostly sunny. A chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 30 percent.
SUNDAY NIGHT
Mostly cloudy with a chance of thunderstorms. A chance of showers. Lows in the mid 60s. Chance of rain 40 percent.
MONDAY AND MONDAY NIGHT
Mostly cloudy. A chance of showers. Highs in the lower 80s. Lows in the lower 60s. Chance of rain 40 percent.
TUESDAY THROUGH WEDNESDAY
Partly cloudy. Highs in the lower 80s. Lows around 60.

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 AM EDT  9/17/2025
Wednesday
17 SEP 2025
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 87° 85° Clear 0%

0% Thunder
( 0% severe)
NE   6 30% 52°
High 90° DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 89° 86° Clear NE   5 27% 51°
Clear



DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 80° 80° Clear 0%

0% Thunder
( 1% severe)
NE   5 41% 54°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 71° 71° Clear ENE   3 57% 55°
Thursday
18 SEP 2025
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 65° 65° Clear 0%

0% Thunder
( 1% severe)
E   3 73% 56°
Low 60° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 62° 63° Partly Cloudy E   3 78% 55°
High 94° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 61° 62° Clear 0%

0% Thunder
( 1% severe)
E   3 81% 55°

Clear



DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 80° 81° Clear SSE   3 47% 58°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 90° 88° Clear 0%

0% Thunder
( 4% severe)
SSE   3 30% 54°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 92° 90° Clear SE   3 27% 53°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 82° 81° Partly Cloudy 3%

0% Thunder
( 2% severe)
E   5 40% 55°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 73° 73° Partly Cloudy ESE   5 55% 56°
Friday
19 SEP 2025
DECATUR, IL 62521 weather forecast Day 3, 0 hours 1 AM 68° 68° Partly Cloudy 3%

0% Thunder
( 2% severe)
SE   5 65% 56°
Low 62° DECATUR, IL 62521 weather forecast Day 3, 3 hours 4 AM 66° 66° Partly Cloudy ESE   5 73% 57°
High 91° DECATUR, IL 62521 weather forecast Day 3, 6 hours 7 AM 64° 65° Partly Cloudy 3%

0% Thunder
( 4% severe)
SE   5 75% 56°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 3, 9 hours 10 AM 80° 81° Partly Cloudy SE   6 51% 60°
DECATUR, IL 62521 weather forecast Day 3, 15 hours 1 PM 88° 87° Partly Cloudy 10%
RAIN
<.01 in
0% Thunder
( 13% severe)
S   7 36% 58°
DECATUR, IL 62521 weather forecast Day 3, 18 hours 4 PM 88° 87° Mostly Cloudy S   7 36% 58°
DECATUR, IL 62521 weather forecast Day 3, 21 hours 7 PM 81° 82° Mostly Cloudy     SSE   7 49% 60°

DECATUR, IL extended weather forecast

Saturday
20 SEP 2025
Sunday
21 SEP 2025
Monday
22 SEP 2025
Tuesday
23 SEP 2025
Wednesday
24 SEP 2025
Low 59° Low 60° Low 59° Low 62° Low 54°
High 84° High 85° High 82° High 78° High 84°
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 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Overcast
56% Rain
Partly Cloudy
39% Rain
Mostly Cloudy
43% Rain
Overcast
53% Rain
Partly Cloudy
24% Rain
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