DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

9:54 AM CDT AUG 2, 2026
Overcast
73°F
Feels Like: 73°F
Dewpoint: 66°F
Rel. Hum.: 79%
Visibility: 10 miles
Wind: NE at 14 mph
Pressure: 29.83 inches
Last 72 hours

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DECATUR, IL 62521
Weather Forecast

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REST OF TODAY
Mostly sunny. Highs around 80. North winds 15 to 20 mph.
TONIGHT
Mostly clear. Lows in the lower 60s. North winds 10 to 15 mph, diminishing to around 5 mph after midnight.
MONDAY
Mostly sunny. Highs in the lower 80s. Northeast winds 5 to 10 mph.
MONDAY NIGHT
Mostly clear. Lows in the lower 60s. East winds 5 to 10 mph.
TUESDAY
Sunny. Highs in the lower 80s. Southeast winds around 5 mph.
TUESDAY NIGHT AND WEDNESDAY
Mostly clear. Lows in the lower 60s. Highs in the mid 80s.
WEDNESDAY NIGHT
Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers after midnight. Lows in the mid 60s. Chance of rain 50 percent.
THURSDAY
Becoming mostly cloudy in the afternoon. Showers likely in the morning. Highs in the lower 80s. Chance of rain 60 percent.
THURSDAY NIGHT
Partly cloudy with a chance of showers. Lows in the mid 60s. Chance of rain 40 percent.
FRIDAY
Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 40 percent.
FRIDAY NIGHT
Partly cloudy with a chance of thunderstorms. A chance of showers. Lows in the mid 60s. Chance of rain 40 percent.
SATURDAY
Partly 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 PM EDT  8/ 1/2026
Sunday
2 AUG 2026
DECATUR, IL 62521 weather forecast Day 1, 0 hours 1 AM 67° 67° Mostly Cloudy 24%
RAIN
.01–.1 in
0% Thunder
( 7% severe)
N   15 100% 67°
Low 65° DECATUR, IL 62521 weather forecast Day 1, 3 hours 4 AM 66° 66° Mostly Cloudy NA   16 100% 66°
High 78° DECATUR, IL 62521 weather forecast Day 1, 6 hours 7 AM 67° 67° Mostly Cloudy 8%

0% Thunder
( 5% severe)
N   17 97% 66°

Mostly Cloudy




Breezy
DECATUR, IL 62521 weather forecast Day 1, 9 hours 10 AM 72° 72° Mostly Cloudy N   18 81% 66°
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 76° 78° Mostly Cloudy 5%

0% Thunder
( 11% severe)
N   18 71% 66°
DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 78° 80° Partly Cloudy N   18 69% 67°
DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 75° 75° Clear 0%

0% Thunder
( 4% severe)
NA   15 74% 66°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 68° 68° Partly Cloudy N   9 93% 66°
Monday
3 AUG 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 64° 64° Clear 0%

0% Thunder
( 1% severe)
N   7 100% 64°
Low 61° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 62° 62° Clear N   7 100% 62°
High 80° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 63° 63° Partly Cloudy 0%

0% Thunder
( 2% severe)
NNE   7 97% 62°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 73° 73° Partly Cloudy NE   8 76% 65°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 79° 81° Clear 0%

0% Thunder
( 4% severe)
NE   9 62% 65°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 80° 82° Partly Cloudy NE   9 58% 64°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 77° 79° Clear 0%

0% Thunder
( 2% severe)
ENE   8 69% 66°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 68° 68° Clear E   6 90% 65°

DECATUR, IL extended weather forecast

Tuesday
4 AUG 2026
Wednesday
5 AUG 2026
Thursday
6 AUG 2026
Friday
7 AUG 2026
Saturday
8 AUG 2026
Low 62° Low 64° Low 69° Low 67° Low 71°
High 88° High 88° High 87° High 91° High 89°
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
Clear
7% Rain
Partly Cloudy
9% Rain
Overcast
60% Rain
Mostly Cloudy
34% Rain
Overcast
51% Rain
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