DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

10:54 PM CDT MAR 21, 2026
Clear
64°F
Feels Like: 63°F
Dewpoint: 48°F
Rel. Hum.: 56%
Visibility: 10 miles
Wind: S at 10 mph
Pressure: 29.75 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. Not as cool with lows around 60. South winds 10 to 15 mph with gusts up to 25 mph.
SUNDAY
Mostly sunny in the morning, then mostly cloudy with a slight chance of showers in the afternoon. Breezy with highs in the upper 70s. Temperature falling into the upper 60s in the afternoon. Southwest winds 10 to 15 mph, increasing to north 20 to 25 mph in the afternoon. Chance of rain 20 percent.
SUNDAY NIGHT
Mostly cloudy in the evening, then clearing. Breezy and much cooler with lows in the lower 30s. North winds 15 to 25 mph with gusts up to 35 mph.
MONDAY
Mostly sunny. Much cooler with highs in the lower 50s. North winds around 10 mph.
MONDAY NIGHT
Mostly cloudy. Lows in the mid 30s. East winds 5 to 10 mph.
TUESDAY
Mostly sunny. Highs around 60.
TUESDAY NIGHT AND WEDNESDAY
Mostly cloudy. Lows in the lower 40s. Highs in the mid 60s.
WEDNESDAY NIGHT
Mostly cloudy. Lows in the lower 50s.
THURSDAY
Mostly sunny. Not as cool with highs in the mid 70s.
THURSDAY NIGHT
Partly cloudy with a chance of rain. Cooler with lows in the upper 30s. Chance of rain 40 percent.
FRIDAY
Partly sunny with a 30 percent chance of rain. Much cooler with highs in the lower 50s.
FRIDAY NIGHT
Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 30s.
SATURDAY
Mostly sunny. Highs in the mid 50s.

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  7:00 AM EST  3/21/2026
Saturday
21 MAR 2026
DECATUR, IL 62521 weather forecast Day 1, 12 hours 12 PM 74° 74° Clear 1%

0% Thunder
( 1% severe)
S   10 40% 48°
High 81° DECATUR, IL 62521 weather forecast Day 1, 15 hours 3 PM 80° 79° Clear SSW   12 33% 48°
Clear



DECATUR, IL 62521 weather forecast Day 1, 18 hours 6 PM 73° 73° Clear 1%

0% Thunder
( 4% severe)
SSW   9 46% 51°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 9 PM 66° 66° Clear SSW   10 63% 53°
Sunday
22 MAR 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 12 AM 64° 63° Partly Cloudy 2%

0% Thunder
( 5% severe)
SSW   12 73% 55°
Low 60° DECATUR, IL 62521 weather forecast Day 2, 3 hours 3 AM 63° 62° Partly Cloudy SSW   13 75% 55°
High 78° DECATUR, IL 62521 weather forecast Day 2, 6 hours 6 AM 62° 61° Partly Cloudy 3%

0% Thunder
( 5% severe)
SW   12 75% 54°

Mostly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 9 AM 71° 71° Partly Cloudy WSW   14 59% 56°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 12 PM 76° 78° Mostly Cloudy 12%
RAIN
<.01 in
0% Thunder
( 11% severe)
NNW   14 46% 54°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 3 PM 68° 68° Mostly Cloudy N   20 45% 46°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 6 PM 53° 47° Mostly Cloudy 7%

0% Thunder
( 7% severe)
N   21 54% 37°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 9 PM 44° 36° Partly Cloudy N   18 62% 32°
Monday
23 MAR 2026
DECATUR, IL 62521 weather forecast Day 3, 0 hours 12 AM 39° 30° Partly Cloudy 0%

0% Thunder
( 0% severe)
N   16 67% 29°
Low 32° DECATUR, IL 62521 weather forecast Day 3, 3 hours 3 AM 35° 26° Partly Cloudy N   13 72% 27°
High 51° DECATUR, IL 62521 weather forecast Day 3, 6 hours 6 AM 33° 24° Partly Cloudy 0%

0% Thunder
( 0% severe)
N   12 74% 26°

Mostly Cloudy



DECATUR, IL 62521 weather forecast Day 3, 9 hours 9 AM 39° 32° Mostly Cloudy NNE   12 59% 26°
DECATUR, IL 62521 weather forecast Day 3, 15 hours 12 PM 47° 42° Partly Cloudy 0%

0% Thunder
( 0% severe)
NNE   10 43% 26°
DECATUR, IL 62521 weather forecast Day 3, 18 hours 3 PM 51° 48° Mostly Cloudy NNE   9 36% 25°
DECATUR, IL 62521 weather forecast Day 3, 21 hours 6 PM 46° 42° Mostly Cloudy     NE   7 45% 26°

DECATUR, IL extended weather forecast

Tuesday
24 MAR 2026
Wednesday
25 MAR 2026
Thursday
26 MAR 2026
Friday
27 MAR 2026
Saturday
28 MAR 2026
Low 34° Low 39° Low 53° Low 40° Low 33°
High 59° High 65° High 67° High 49° High 58°
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
9% Rain
Mostly Cloudy
51% Rain
Overcast
55% Rain
Mostly Cloudy
65% Rain
Partly Cloudy
23% Rain
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