DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

10:54 PM CDT MAR 31, 2026
Overcast
Thunder Rain
Mist
NA
Feels Like: NA
Dewpoint: NA
Rel. Hum.: NA%
Visibility: 5 miles
Wind: N at 5 mph
Pressure:
Last 72 hours

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DECATUR, IL 62521
Weather Forecast

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Snow Depth pages
REST OF TONIGHT
Showers with thunderstorms likely. Much cooler with lows in the mid 40s. Northwest winds 10 to 15 mph, becoming northeast. Chance of rain near 100 percent.
WEDNESDAY
A chance of thunderstorms. Showers. Much cooler with highs in the upper 50s. Northeast winds around 15 mph with gusts up to 25 mph. Chance of rain near 100 percent.
WEDNESDAY NIGHT
A chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows in the mid 50s. Temperature rising to around 60 after midnight. East winds 15 to 20 mph. Chance of rain 50 percent.
THURSDAY
Mostly cloudy. A chance of showers in the morning, then showers with a chance of thunderstorms in the afternoon. Windy and not as cool with highs in the mid 70s. South winds 20 to 30 mph with gusts up to 45 mph. Chance of rain 90 percent.
THURSDAY NIGHT
Showers likely in the evening, then partly cloudy with a chance of showers after midnight. Breezy with lows in the mid 50s. Southwest winds 20 to 25 mph with gusts up to 35 mph, diminishing to 10 to 15 mph with gusts up to 25 mph after midnight. Chance of rain 70 percent.
FRIDAY
Partly sunny. A chance of showers in the afternoon. Highs in the upper 70s. Chance of rain 50 percent.
FRIDAY NIGHT
A chance of thunderstorms. Showers. Lows in the lower 50s. Chance of rain 90 percent.
SATURDAY
Showers likely with a chance of thunderstorms in the morning, then a chance of showers in the afternoon. Breezy, cooler with highs in the mid 60s. Chance of rain 70 percent.
SATURDAY NIGHT
Mostly cloudy with a chance of rain showers in the evening, then partly cloudy after midnight. Much cooler with lows in the mid 30s. Chance of rain 50 percent.
SUNDAY
Mostly sunny. Cooler with highs around 50.
SUNDAY NIGHT AND MONDAY
Mostly clear. Lows in the lower 30s. Highs in the upper 50s.
MONDAY NIGHT AND TUESDAY
Partly cloudy. Lows in the upper 30s. Highs in the mid 60s.

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  3/31/2026
Tuesday
31 MAR 2026
DECATUR, IL 62521 weather forecast Day 1, 12 hours 12 PM 78° 79° Mostly Cloudy 42%
RAIN
.5–1 in
0% Thunder
( 31% severe)
SW   21 48% 57°
High 79° DECATUR, IL 62521 weather forecast Day 1, 15 hours 3 PM 78° 79° Mostly Cloudy SW   18 50% 58°
Mostly Cloudy

Rain Likely

DECATUR, IL 62521 weather forecast Day 1, 18 hours 6 PM 73° 73° Mostly Cloudy 86%
RAIN
***
0% Thunder
( 52% severe)
SW   12 57% 57°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 9 PM 65° 65° Mostly Cloudy WSW   10 78% 58°
Wednesday
1 APR 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 12 AM 58° 56° Mostly Cloudy 86%
RAIN
***
0% Thunder
( 42% severe)
NNE   10 87% 54°
Low 47° DECATUR, IL 62521 weather forecast Day 2, 3 hours 3 AM 52° 48° Mostly Cloudy NE   13 89% 49°
High 62° DECATUR, IL 62521 weather forecast Day 2, 6 hours 6 AM 48° 42° Mostly Cloudy 81%
RAIN
***
0% Thunder
( 22% severe)
NE   14 89% 45°

Mostly Cloudy

Rain Likely

DECATUR, IL 62521 weather forecast Day 2, 9 hours 9 AM 48° 42° Mostly Cloudy ENE   14 89% 45°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 12 PM 53° 49° Mostly Cloudy 71%
RAIN
***
0% Thunder
( 33% severe)
ENE   13 80% 47°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 3 PM 57° 54° Mostly Cloudy E   13 77% 50°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 6 PM 58° 55° Mostly Cloudy 43%
RAIN
.5–1 in
0% Thunder
( 23% severe)
E   13 80% 52°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 9 PM 58° 55° Mostly Cloudy E   14 83% 53°
Thursday
2 APR 2026
DECATUR, IL 62521 weather forecast Day 3, 0 hours 12 AM 60° 58° Mostly Cloudy 34%
RAIN
.25–.5 in
0% Thunder
( 12% severe)
SE   14 87% 56°
Low 56° DECATUR, IL 62521 weather forecast Day 3, 3 hours 3 AM 62° 60° Mostly Cloudy S   16 84% 57°
High 76° DECATUR, IL 62521 weather forecast Day 3, 6 hours 6 AM 63° 61° Mostly Cloudy 40%
RAIN
.25–.5 in
0% Thunder
( 15% severe)
S   18 87% 59°

Mostly Cloudy

Rain Likely


Windy
DECATUR, IL 62521 weather forecast Day 3, 9 hours 9 AM 68° 68° Mostly Cloudy S   23 78% 61°
DECATUR, IL 62521 weather forecast Day 3, 15 hours 12 PM 72° 72° Mostly Cloudy 82%
RAIN
***
0% Thunder
( 35% severe)
S   25 68% 61°
DECATUR, IL 62521 weather forecast Day 3, 18 hours 3 PM 73° 73° Mostly Cloudy S   25 62% 59°
DECATUR, IL 62521 weather forecast Day 3, 21 hours 6 PM 69° 69° Mostly Cloudy     SSW   21 68% 58°

DECATUR, IL extended weather forecast

Friday
3 APR 2026
Saturday
4 APR 2026
Sunday
5 APR 2026
Monday
6 APR 2026
Tuesday
7 APR 2026
Low 57° Low 57° Low 37° Low 33° Low 39°
High 78° High 63° High 51° High 56° High 56°
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
Mostly Cloudy
39% Rain
Overcast
80% Rain
Mostly Cloudy
27% Rain
Clear
12% Rain
Partly Cloudy
22% Rain
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