DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

4:54 AM CDT JUL 15, 2026
Clear
68°F
Feels Like: 68°F
Dewpoint: 66°F
Rel. Hum.: 93%
Visibility: 8 miles
Wind: Calm
Pressure: 30.13 inches
Last 72 hours

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DECATUR, IL 62521
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TODAY
Patchy fog this morning. Sunny. Highs around 90. North winds around 5 mph, becoming southeast this afternoon.
TONIGHT
Mostly clear. Humid with lows in the lower 70s. Southeast winds around 5 mph in the evening, becoming light and variable.
THURSDAY
Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Humid with highs around 90. Light and variable winds, becoming south around 5 mph in the afternoon. Chance of rain 20 percent. Heat index values up to 100.
THURSDAY NIGHT
Partly cloudy. Humid with lows in the lower 70s. Southwest winds around 5 mph.
FRIDAY
Mostly sunny with a chance of thunderstorms. A chance of showers in the morning, then showers in the afternoon. Humid with highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 80 percent.
FRIDAY NIGHT
Partly cloudy. Lows in the lower 70s.
SATURDAY THROUGH SUNDAY NIGHT
Mostly clear. Highs in the upper 80s. Lows around 70.
MONDAY AND MONDAY NIGHT
Partly cloudy. Highs in the upper 80s. Lows around 70.
TUESDAY
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  7/14/2026
Wednesday
15 JUL 2026
DECATUR, IL 62521 weather forecast Day 1, 0 hours 1 AM 72° 72° Clear 0%

0% Thunder
( 1% severe)
  CALM 87% 68°
Low 69° DECATUR, IL 62521 weather forecast Day 1, 3 hours 4 AM 70° 70° Clear   CALM 93% 68°
High 90° DECATUR, IL 62521 weather forecast Day 1, 6 hours 7 AM 73° 73° Clear 0%

0% Thunder
( 2% severe)
  CALM 90% 70°

Clear



DECATUR, IL 62521 weather forecast Day 1, 9 hours 10 AM 84° 90° Clear   CALM 67% 72°
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 88° 94° Clear 1%

0% Thunder
( 5% severe)
  CALM 57% 71°
DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 89° 94° Clear   CALM 54% 70°
DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 87° 93° Clear 0%

0% Thunder
( 7% severe)
SE   3 61% 72°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 77° 79° Clear   CALM 82% 71°
Thursday
16 JUL 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 73° 73° Partly Cloudy 1%

0% Thunder
( 3% severe)
  CALM 90% 70°
Low 71° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 72° 72° Partly Cloudy   CALM 93% 70°
High 89° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 75° 75° Clear 7%

0% Thunder
( 19% severe)
  CALM 90% 72°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 84° 91° Partly Cloudy   CALM 72% 74°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 88° 96° Partly Cloudy 19%
RAIN
.01–.1 in
0% Thunder
( 31% severe)
S   5 61% 73°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 88° 95° Partly Cloudy S   6 59% 72°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 86° 93° Partly Cloudy 11%
RAIN
<.01 in
0% Thunder
( 39% severe)
S   5 65% 73°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 77° 78° Partly Cloudy S   2 90% 74°

DECATUR, IL extended weather forecast

Friday
17 JUL 2026
Saturday
18 JUL 2026
Sunday
19 JUL 2026
Monday
20 JUL 2026
Tuesday
21 JUL 2026
Low 72° Low 72° Low 70° Low 66° Low 68°
High 88° High 92° High 86° High 89° High 85°
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
Overcast
91% Rain
Mostly Cloudy
40% Rain
Partly Cloudy
40% Rain
Partly Cloudy
20% Rain
Partly Cloudy
23% Rain
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