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Summer forecast 2026: Get ready for widespread heat as El Niño strengthens. Chevron right
Frost, record-challenging chill is headed for the eastern US. See how cold it will get. Chevron right

Decatur, IL

41°F
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Decatur

Illinois

41°
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Decatur, IL Weather
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April 30 - May 14

Thu 4/30

62° /41°
49%
Some sunshine giving way to clouds with a shower in places this afternoon

RealFeel®68°

RealFeel Shade™59°

Max UV Index9.0 (Very High)

WindW 9 mph

Fri 5/1

58° /43°
7%
Cool with times of clouds and sun

RealFeel®57°

RealFeel Shade™54°

Max UV Index8.0 (Very High)

WindNNW 10 mph

Sat 5/2

60° /40°
55%
Times of clouds and sun with a shower in spots

RealFeel®62°

RealFeel Shade™58°

Max UV Index4.0 (Moderate)

WindNE 7 mph

Sun 5/3

66° /51°
13%
Mostly cloudy; breezy in the afternoon

RealFeel®64°

RealFeel Shade™62°

Max UV Index5.0 (Moderate)

WindSSW 13 mph

Mon 5/4

72° /53°
30%
Mostly cloudy and breezy; an afternoon thunderstorm possible

RealFeel®71°

RealFeel Shade™67°

Max UV Index5.0 (Moderate)

WindSW 17 mph

Tue 5/5

67° /52°
25%
Pleasant with intervals of clouds and sun

RealFeel®68°

RealFeel Shade™63°

Max UV Index5.0 (Moderate)

WindNNE 12 mph

Wed 5/6

57° /42°
75%
Cloudy with rain and a thunderstorm tapering to showers

RealFeel®53°

RealFeel Shade™50°

Max UV Index2.0 (Low)

WindNW 15 mph

Thu 5/7

59° /41°
62%
Mostly cloudy with a couple of showers

RealFeel®56°

RealFeel Shade™55°

Max UV Index3.0 (Moderate)

WindNW 10 mph

Fri 5/8

64° /48°
3%
Plenty of sun

RealFeel®68°

RealFeel Shade™61°

Max UV Index9.0 (Very High)

WindSW 9 mph

Sat 5/9

61° /47°
1%
Turning cloudy

RealFeel®66°

RealFeel Shade™58°

Max UV Index10.0 (Very High)

WindSW 9 mph

Sun 5/10

66° /49°
85%
Mostly cloudy; rain in the morning followed by a shower in spots in the afternoon

RealFeel®66°

RealFeel Shade™62°

Max UV Index5.0 (Moderate)

WindWSW 18 mph

Mon 5/11

65° /50°
1%
Plenty of sunshine

RealFeel®76°

RealFeel Shade™65°

Max UV Index10.0 (Very High)

WindW 6 mph

Tue 5/12

68° /54°
1%
Plenty of sunshine

RealFeel®72°

RealFeel Shade™64°

Max UV Index10.0 (Very High)

WindSSW 9 mph

Wed 5/13

72° /52°
25%
Cloudy

RealFeel®72°

RealFeel Shade™71°

Max UV Index3.0 (Moderate)

WindESE 7 mph

Thu 5/14

70° /58°
79%
Cloudy with rain tapering off

RealFeel®69°

RealFeel Shade™69°

Max UV Index2.0 (Low)

WindE 7 mph

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World North America United States Illinois Decatur

Weather Near Decatur:

  • Champaign, IL
  • Peoria, IL
  • Springfield, IL
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