DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

3:54 PM CDT SEP 7, 2026
Clear
82°F
Feels Like: 81°F
Dewpoint: 55°F
Rel. Hum.: 40%
Visibility: 10 miles
Wind: ENE at 9 mph, gusts to 21
Pressure: 30.10 inches
Last 72 hours

Local Area Snow Depth

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DECATUR, IL 62521
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Mostly clear. Lows around 60. East winds 5 to 10 mph.
TUESDAY
Mostly sunny. Highs in the lower 90s. South winds 5 to 10 mph.
TUESDAY NIGHT
Partly cloudy. Not as cool with lows around 70. South winds 10 to 15 mph.
WEDNESDAY
Mostly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the lower 90s. Southwest winds 10 to 15 mph. Chance of rain 50 percent.
WEDNESDAY NIGHT
Showers likely in the evening, then showers after midnight. Humid with lows in the mid 60s. West winds 5 to 10 mph. Chance of rain 90 percent.
THURSDAY
Mostly cloudy with a chance of showers in the morning, then mostly sunny in the afternoon. Not as warm with highs in the lower 80s. Chance of rain 40 percent.
THURSDAY NIGHT AND FRIDAY
Mostly clear. Lows in the upper 50s. Highs in the mid 80s.
FRIDAY NIGHT
Partly cloudy. A chance of showers after midnight. Lows in the lower 60s. Chance of rain 30 percent.
SATURDAY
Mostly sunny. Highs in the upper 80s.
SATURDAY NIGHT
Mostly clear. Lows in the mid 60s.
SUNDAY
Mostly sunny. Highs in the upper 80s.
SUNDAY NIGHT
Mostly clear. Lows in the lower 60s.
MONDAY
Mostly sunny. Highs in the mid 80s.

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/ 7/2026
Monday
7 SEP 2026
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 81° 81° Clear 0%

0% Thunder
( 1% severe)
E   10 42% 56°
High 84° DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 83° 82° Clear E   10 40% 56°
Clear



DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 77° 79° Clear 0%

0% Thunder
( 1% severe)
E   10 50% 57°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 67° 67° Clear E   8 75% 59°
Tuesday
8 SEP 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 64° 64° Partly Cloudy 0%

0% Thunder
( 1% severe)
E   6 84% 59°
Low 60° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 62° 62° Partly Cloudy ESE   6 90% 59°
High 91° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 61° 61° Partly Cloudy 0%

0% Thunder
( 1% severe)
ESE   6 93% 59°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 78° 80° Partly Cloudy S   7 58% 62°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 87° 86° Mostly Cloudy 1%

0% Thunder
( 1% severe)
S   9 38% 58°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 91° 90° Partly Cloudy S   9 32% 57°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 84° 84° Partly Cloudy 0%

0% Thunder
( 1% severe)
SSE   8 43% 59°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 74° 74° Partly Cloudy S   7 64% 61°
Wednesday
9 SEP 2026
DECATUR, IL 62521 weather forecast Day 3, 0 hours 1 AM 73° 73° Partly Cloudy 1%

0% Thunder
( 3% severe)
S   10 68% 62°
Low 73° DECATUR, IL 62521 weather forecast Day 3, 3 hours 4 AM 73° 73° Partly Cloudy S   13 71% 63°
High 91° DECATUR, IL 62521 weather forecast Day 3, 6 hours 7 AM 73° 73° Partly Cloudy 7%

0% Thunder
( 15% severe)
SSW   14 76% 65°

Partly Cloudy

Chance of Rain

DECATUR, IL 62521 weather forecast Day 3, 9 hours 10 AM 84° 86° Partly Cloudy WSW   14 55% 66°
DECATUR, IL 62521 weather forecast Day 3, 15 hours 1 PM 90° 92° Partly Cloudy 38%
RAIN
.1–.25 in
0% Thunder
( 23% severe)
WSW   13 45% 66°
DECATUR, IL 62521 weather forecast Day 3, 18 hours 4 PM 89° 92° Mostly Cloudy W   13 48% 67°
DECATUR, IL 62521 weather forecast Day 3, 21 hours 7 PM 81° 84° Partly Cloudy     W   9 65% 68°

DECATUR, IL extended weather forecast

Thursday
10 SEP 2026
Friday
11 SEP 2026
Saturday
12 SEP 2026
Sunday
13 SEP 2026
Monday
14 SEP 2026
Low 66° Low 60° Low 63° Low 68° Low 64°
High 85° High 88° High 89° High 90° High 93°
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
Mostly Cloudy
44% Rain
Partly Cloudy
11% Rain
Partly Cloudy
26% Rain
Partly Cloudy
38% Rain
Partly Cloudy
37% Rain
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