DECATUR, IL 62521 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

7:54 AM CDT MAY 2, 2026
Overcast
45°F
Feels Like: 40°F
Dewpoint: 36°F
Rel. Hum.: 71%
Visibility: 10 miles
Wind: E at 9 mph
Pressure: 30.12 inches
Last 72 hours

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DECATUR, IL 62521
Weather Forecast

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REST OF TODAY
Mostly sunny. Highs in the upper 50s. Northeast winds 5 to 10 mph, becoming northwest this afternoon.
TONIGHT
Mostly clear. Lows in the upper 30s. West winds 5 to 10 mph, becoming south after midnight.
SUNDAY
Partly sunny. A slight chance of showers and thunderstorms in the afternoon. Breezy and not as cool with highs in the upper 60s. Southwest winds 15 to 25 mph. Chance of rain 20 percent.
SUNDAY NIGHT
Mostly cloudy in the evening, then becoming partly cloudy. A chance of thunderstorms in the evening. A chance of showers. Not as cool with lows in the upper 40s. Southwest winds 10 to 15 mph. Chance of rain 40 percent.
MONDAY
Mostly sunny. Highs in the mid 70s. Southwest winds 15 to 20 mph with gusts up to 30 mph.
MONDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the mid 50s. Chance of rain 60 percent.
TUESDAY
Showers likely in the morning, then showers with a chance of thunderstorms in the afternoon. Cooler with highs in the mid 60s. Chance of rain 80 percent.
TUESDAY NIGHT
Showers likely, mainly in the evening. Cooler with lows in the mid 40s. Chance of rain 70 percent.
WEDNESDAY AND WEDNESDAY NIGHT
Mostly cloudy with a 40 percent chance of showers. Highs in the upper 50s. Lows in the lower 40s.
THURSDAY
Partly sunny. Highs in the upper 50s.
THURSDAY NIGHT AND FRIDAY
Partly cloudy. Lows in the lower 40s. 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  8:00 PM EDT  5/ 1/2026
Saturday
2 MAY 2026
DECATUR, IL 62521 weather forecast Day 1, 0 hours 1 AM 45° 43° Partly Cloudy 9%

0% Thunder
( 5% severe)
NE   5 79% 39°
Low 40° DECATUR, IL 62521 weather forecast Day 1, 3 hours 4 AM 42° 39° Partly Cloudy ENE   5 82% 37°
High 57° DECATUR, IL 62521 weather forecast Day 1, 6 hours 7 AM 41° 37° Partly Cloudy 5%

0% Thunder
( 3% severe)
ENE   6 79% 35°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 1, 9 hours 10 AM 50° 47° Partly Cloudy NE   7 58% 36°
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 54° 51° Partly Cloudy 1%

0% Thunder
( 2% severe)
NNW   9 43% 32°
DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 57° 55° Partly Cloudy NNW   10 34% 29°
DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 55° 53° Partly Cloudy 0%

0% Thunder
( 1% severe)
NW   8 37% 29°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 47° 46° Clear WSW   3 53% 31°
Sunday
3 MAY 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 43° 40° Clear 1%

0% Thunder
( 1% severe)
SSW   5 62% 31°
Low 39° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 41° 36° Clear SSW   8 67% 31°
High 68° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 43° 37° Partly Cloudy 2%

0% Thunder
( 4% severe)
SSW   12 68% 33°

Mostly Cloudy




Breezy
DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 55° 51° Partly Cloudy SSW   16 53% 38°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 62° 59° Mostly Cloudy 11%
RAIN
<.01 in
0% Thunder
( 21% severe)
SSW   20 44% 40°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 67° 67° Mostly Cloudy SW   20 42% 43°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 65° 65° Mostly Cloudy 30%
RAIN
***
0% Thunder
( 24% severe)
SW   14 50% 46°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 59° 57° Mostly Cloudy WSW   10 67% 48°

DECATUR, IL extended weather forecast

Monday
4 MAY 2026
Tuesday
5 MAY 2026
Wednesday
6 MAY 2026
Thursday
7 MAY 2026
Friday
8 MAY 2026
Low 52° Low 58° Low 42° Low 42° Low 45°
High 76° High 58° High 56° High 58° High 68°
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
47% Rain
Overcast
83% Rain
Overcast
80% Rain
Overcast
56% Rain
Partly Cloudy
28% Rain
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