DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

11:54 AM CDT AUG 8, 2026
Clear
84°F
Feels Like: 90°F
Dewpoint: 73°F
Rel. Hum.: 70%
Visibility: 10 miles
Wind: W at 6 mph
Pressure: 30.08 inches
Last 72 hours

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DECATUR, IL 62521
Weather Forecast

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Snow Depth pages
REST OF TODAY
Mostly sunny. Highs in the mid 80s. West winds 5 to 10 mph.
TONIGHT
Mostly clear. Lows in the upper 60s. North winds around 5 mph, becoming southeast around 5 mph after midnight.
SUNDAY
Mostly sunny. Humid with highs in the upper 80s. South winds 10 to 15 mph.
SUNDAY NIGHT
Partly cloudy. Humid with lows in the lower 70s. South winds 10 to 15 mph with gusts up to 25 mph.
MONDAY
Mostly sunny. Humid with highs around 90. Southwest winds 10 to 15 mph. Heat index values up to 102 in the afternoon.
MONDAY NIGHT
Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 30 percent.
TUESDAY
Mostly sunny. Highs in the upper 80s.
TUESDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 70s. Chance of rain 60 percent.
WEDNESDAY
Partly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.
WEDNESDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms in the evening. A chance of showers. Lows in the upper 60s. Chance of rain 50 percent.
THURSDAY
Mostly cloudy. A chance of showers in the morning, then showers likely in the afternoon. Highs in the lower 80s. Chance of rain 60 percent.
THURSDAY NIGHT AND FRIDAY
Mostly cloudy. A chance of showers. Lows in the mid 60s. Highs in the upper 70s. Chance of rain 50 percent.

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  8/ 8/2026
Saturday
8 AUG 2026
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 83° 87° Clear 8%

0% Thunder
( 15% severe)
WNW   7 65% 70°
High 85° DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 84° 87° Clear WNW   7 59% 68°
Clear



DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 81° 84° Clear 0%

0% Thunder
( 8% severe)
NNW   3 67% 69°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 71° 71° Clear   CALM 90% 68°
Sunday
9 AUG 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 68° 68° Partly Cloudy 1%

0% Thunder
( 9% severe)
SSE   1 97% 67°
Low 66° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 67° 67° Partly Cloudy SSE   5 100% 67°
High 88° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 69° 69° Partly Cloudy 6%

0% Thunder
( 7% severe)
S   7 97% 68°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 80° 84° Partly Cloudy SSW   10 77% 72°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 86° 93° Partly Cloudy 6%

0% Thunder
( 14% severe)
S   14 65% 73°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 87° 94° Partly Cloudy SSW   16 63% 73°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 84° 90° Partly Cloudy 5%

0% Thunder
( 15% severe)
S   14 70% 73°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 78° 80° Partly Cloudy S   14 82% 72°
Monday
10 AUG 2026
DECATUR, IL 62521 weather forecast Day 3, 0 hours 1 AM 77° 79° Partly Cloudy 8%

0% Thunder
( 17% severe)
S   13 82% 71°
Low 74° DECATUR, IL 62521 weather forecast Day 3, 3 hours 4 AM 75° 75° Partly Cloudy SSW   12 87% 71°
High 89° DECATUR, IL 62521 weather forecast Day 3, 6 hours 7 AM 74° 74° Partly Cloudy 4%

0% Thunder
( 16% severe)
S   10 87% 70°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 3, 9 hours 10 AM 82° 87° Partly Cloudy SSW   12 74% 73°
DECATUR, IL 62521 weather forecast Day 3, 15 hours 1 PM 87° 97° Partly Cloudy 7%

0% Thunder
( 23% severe)
SSW   13 68% 75°
DECATUR, IL 62521 weather forecast Day 3, 18 hours 4 PM 88° 98° Partly Cloudy SSW   15 66% 75°
DECATUR, IL 62521 weather forecast Day 3, 21 hours 7 PM 85° 93° Partly Cloudy     SSW   13 72% 75°

DECATUR, IL extended weather forecast

Tuesday
11 AUG 2026
Wednesday
12 AUG 2026
Thursday
13 AUG 2026
Friday
14 AUG 2026
Saturday
15 AUG 2026
Low 74° Low 68° Low 69° Low 65° Low 62°
High 95° High 90° High 83° High 83° High 79°
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
Partly Cloudy
35% Rain
Partly Cloudy
48% Rain
Overcast
59% Rain
Mostly Cloudy
31% Rain
Overcast
32% Rain
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