DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

9:54 PM CDT JUN 29, 2026
Clear
81°F
Feels Like: 87°F
Dewpoint: 75°F
Rel. Hum.: 82%
Visibility: 10 miles
Wind: SSW at 9 mph
Pressure: 29.96 inches
Last 72 hours

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DECATUR, IL 62521
Weather Forecast

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REST OF TONIGHT
Partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph with gusts up to 20 mph.
TUESDAY
Sunny with highs in the mid 90s. Southwest winds 10 to 15 mph. Heat index values up to 109.
TUESDAY NIGHT
Clear with lows in the mid 70s. South winds 10 to 15 mph.
WEDNESDAY
Sunny with highs in the lower 90s. Southwest winds 10 to 15 mph. Heat index values up to 105.
WEDNESDAY NIGHT
Clear with lows in the mid 70s. South winds 5 to 10 mph with gusts up to 20 mph.
THURSDAY
Sunny. Highs in the lower 90s. Heat index values up to 105.
THURSDAY NIGHT AND FRIDAY
Partly cloudy. A chance of showers and thunderstorms. Lows in the mid 70s. Highs in the lower 90s. Chance of rain 40 percent.
FRIDAY NIGHT
Partly cloudy. Lows in the lower 70s.
INDEPENDENCE DAY AND SATURDAY NIGHT
Partly cloudy. A chance of showers and thunderstorms. Highs around 90. Lows in the lower 70s. Chance of rain 30 percent.
SUNDAY AND SUNDAY NIGHT
Partly cloudy. A chance of showers and thunderstorms. Highs in the upper 80s. Lows in the upper 60s. Chance of rain 50 percent.
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  6/29/2026
Monday
29 JUN 2026
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 89° 99° Mostly Cloudy 1%

0% Thunder
( 6% severe)
S   14 64% 75°
High 92° DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 91° 102° Mostly Cloudy S   16 60% 75°
Mostly Cloudy



DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 89° 98° Mostly Cloudy 1%

0% Thunder
( 6% severe)
S   14 61% 74°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 82° 87° Mostly Cloudy S   14 74% 73°
Tuesday
30 JUN 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 78° 80° Partly Cloudy 0%

0% Thunder
( 7% severe)
SSW   12 82% 72°
Low 75° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 76° 77° Partly Cloudy SSW   10 85% 71°
High 93° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 78° 80° Partly Cloudy 0%

0% Thunder
( 7% severe)
SSW   10 82% 72°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 86° 93° Partly Cloudy SW   13 65% 73°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 90° 100° Partly Cloudy 0%

0% Thunder
( 7% severe)
SW   13 60% 74°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 93° 103° Partly Cloudy SSW   14 54% 74°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 91° 101° Clear 0%

0% Thunder
( 9% severe)
SSW   13 58% 74°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 82° 87° Clear S   12 72% 72°
Wednesday
1 JUL 2026
DECATUR, IL 62521 weather forecast Day 3, 0 hours 1 AM 78° 80° Clear 0%

0% Thunder
( 9% severe)
SSW   10 76% 70°
Low 75° DECATUR, IL 62521 weather forecast Day 3, 3 hours 4 AM 75° 75° Clear SSW   8 84% 70°
High 93° DECATUR, IL 62521 weather forecast Day 3, 6 hours 7 AM 77° 79° Clear 0%

0% Thunder
( 9% severe)
SSW   8 82% 71°

Clear



DECATUR, IL 62521 weather forecast Day 3, 9 hours 10 AM 87° 93° Clear SW   10 61% 72°
DECATUR, IL 62521 weather forecast Day 3, 15 hours 1 PM 91° 100° Clear 2%

0% Thunder
( 11% severe)
SSW   12 56% 73°
DECATUR, IL 62521 weather forecast Day 3, 18 hours 4 PM 93° 101° Clear SSW   13 51% 72°
DECATUR, IL 62521 weather forecast Day 3, 21 hours 7 PM 90° 96° Clear     S   13 54% 71°

DECATUR, IL extended weather forecast

Thursday
2 JUL 2026
Friday
3 JUL 2026
Saturday
4 JUL 2026
Sunday
5 JUL 2026
Monday
6 JUL 2026
Low 76° Low 71° Low 72° Low 72° Low 70°
High 90° High 93° High 93° High 93° High 89°
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
53% Rain
Partly Cloudy
49% Rain
Partly Cloudy
39% Rain
Partly Cloudy
39% Rain
Partly Cloudy
42% Rain
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