DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

6:54 PM CDT MAR 29, 2026
Clear
64°F
Feels Like: 63°F
Dewpoint: 37°F
Rel. Hum.: 37%
Visibility: 10 miles
Wind: SSW at 13 mph
Pressure: 30.06 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 cloudy. Not as cool with lows in the mid 50s. South winds around 15 mph with gusts up to 25 mph.
MONDAY
Mostly sunny. Not as cool with highs in the upper 70s. Southwest winds 15 to 20 mph with gusts up to 30 mph.
MONDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s. South winds 15 to 20 mph with gusts up to 30 mph.
TUESDAY
Partly sunny. A chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Windy with highs in the lower 80s. Southwest winds 20 to 30 mph with gusts up to 40 mph. Chance of rain 50 percent.
TUESDAY NIGHT
Thunderstorms likely in the evening. Showers, cooler with lows in the upper 40s. Southwest winds 15 to 20 mph, becoming north after midnight. Chance of rain 90 percent.
WEDNESDAY
Showers likely in the morning, then showers likely with a chance of thunderstorms in the afternoon. Much cooler with highs in the upper 50s. Chance of rain 70 percent.
WEDNESDAY NIGHT
A chance of thunderstorms in the evening. Showers. Lows in the mid 40s. Chance of rain 90 percent.
THURSDAY
Showers. Highs in the mid 60s. Chance of rain 90 percent.
THURSDAY NIGHT
Showers likely, mainly in the evening. Lows in the mid 40s. Chance of rain 70 percent.
FRIDAY AND FRIDAY NIGHT
Mostly cloudy with a 50 percent chance of showers. Highs in the upper 60s. Lows in the lower 50s.
SATURDAY AND SATURDAY NIGHT
Showers likely. Highs in the upper 60s. Lows in the mid 40s. Chance of rain 70 percent.
SUNDAY
Partly sunny. A chance of showers in the morning. Breezy, cooler with highs in the upper 50s. 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  7:00 AM EST  3/29/2026
Sunday
29 MAR 2026
DECATUR, IL 62521 weather forecast Day 1, 12 hours 12 PM 61° 59° Partly Cloudy 4%

0% Thunder
( 3% severe)
SSW   16 36% 34°
High 66° DECATUR, IL 62521 weather forecast Day 1, 15 hours 3 PM 65° 65° Mostly Cloudy S   16 33% 35°
Mostly Cloudy



DECATUR, IL 62521 weather forecast Day 1, 18 hours 6 PM 60° 58° Mostly Cloudy 6%

0% Thunder
( 2% severe)
S   13 44% 38°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 9 PM 57° 54° Mostly Cloudy S   14 53% 40°
Monday
30 MAR 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 12 AM 56° 53° Partly Cloudy 4%

0% Thunder
( 6% severe)
SSW   14 59% 42°
Low 54° DECATUR, IL 62521 weather forecast Day 2, 3 hours 3 AM 56° 53° Mostly Cloudy SSW   14 66% 45°
High 79° DECATUR, IL 62521 weather forecast Day 2, 6 hours 6 AM 56° 53° Mostly Cloudy 3%

0% Thunder
( 8% severe)
S   14 74% 48°

Partly Cloudy




Breezy
DECATUR, IL 62521 weather forecast Day 2, 9 hours 9 AM 65° 65° Partly Cloudy SSW   17 63% 52°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 12 PM 75° 75° Partly Cloudy 3%

0% Thunder
( 9% severe)
SSW   18 50% 55°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 3 PM 78° 79° Partly Cloudy SSW   18 47% 56°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 6 PM 73° 73° Partly Cloudy 2%

0% Thunder
( 8% severe)
S   16 57% 57°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 9 PM 68° 68° Mostly Cloudy S   18 65% 56°
Tuesday
31 MAR 2026
DECATUR, IL 62521 weather forecast Day 3, 0 hours 12 AM 66° 66° Mostly Cloudy 12%
RAIN
<.01 in
0% Thunder
( 8% severe)
SSW   18 68% 55°
Low 62° DECATUR, IL 62521 weather forecast Day 3, 3 hours 3 AM 64° 62° Mostly Cloudy SSW   18 73% 55°
High 81° DECATUR, IL 62521 weather forecast Day 3, 6 hours 6 AM 63° 61° Mostly Cloudy 25%
RAIN
<.01 in
0% Thunder
( 16% severe)
SSW   18 78% 56°

Mostly Cloudy

Chance of Rain


Windy
DECATUR, IL 62521 weather forecast Day 3, 9 hours 9 AM 70° 70° Mostly Cloudy SSW   22 63% 57°
DECATUR, IL 62521 weather forecast Day 3, 15 hours 12 PM 78° 79° Mostly Cloudy 49%
RAIN
1–2 in
0% Thunder
( 30% severe)
SW   24 48% 57°
DECATUR, IL 62521 weather forecast Day 3, 18 hours 3 PM 79° 80° Mostly Cloudy SW   22 44% 55°
DECATUR, IL 62521 weather forecast Day 3, 21 hours 6 PM 72° 72° Mostly Cloudy     SW   17 53% 54°

DECATUR, IL extended weather forecast

Wednesday
1 APR 2026
Thursday
2 APR 2026
Friday
3 APR 2026
Saturday
4 APR 2026
Sunday
5 APR 2026
Low 56° Low 44° Low 38° Low 47° Low 45°
High 62° High 52° High 58° High 64° High 55°
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
Overcast
85% Rain
Overcast
86% Rain
Overcast
17% Rain
Overcast
55% Rain
Overcast
59% Rain
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