Decatur, IL Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Decatur, IL.

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Current Conditions — Decatur, IL

LINCOLN (KAAA)

Clear

71.8 F
Humidity:67%
Wind Speed:S 12.7 G 16.1 mph
Barometer:29.92 in
Dewpoint:60.3 F
Visibility:10.00 mi
Precip:--
Heat Index:71.8 F
Wind Chill:NA
Apr 23 2026, 09:35 AM CDT
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5-Day Forecast — Decatur, IL

Thursday

High 80 °F
Partly Sunny
Thursday
Night
Low 62 °F
T-storms Likely
Friday

High 73 °F
T-storms
Friday
Night
Low 50 °F
Mostly Cloudy
Saturday

High 73 °F
Mostly Sunny
Saturday
Night
Low 50 °F
Mostly Cloudy
Sunday

High 75 °F
Mostly Cloudy
Sunday
Night
Low 59 °F
T-storms Likely
Monday

High 73 °F
T-storms

Detailed Forecast — Decatur, IL

Thursday
Partly Sunny. High near 80°F. Wind 12 to 20 mph, with gusts as high as 30 mph.
Thursday Night
Thunderstorms Likely. Low around 62°F. Wind 14 to 16 mph, with gusts as high as 26 mph.
Friday
Thunderstorms. High near 73°F. Wind 10 to 14 mph, with gusts as high as 23 mph.
Friday Night
Mostly Cloudy. Low around 50°F. Wind 7 to 9 mph, with gusts as high as 15 mph.
Saturday
Mostly Sunny. High near 73°F. Wind 8 to 9 mph, with gusts as high as 14 mph.
Saturday Night
Mostly Cloudy. Low around 50°F. Wind around 8 mph, with gusts as high as 14 mph.
Sunday
Mostly Cloudy. High near 75°F. Wind 12 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Thunderstorms Likely. Low around 59°F. Wind around 16 mph, with gusts as high as 23 mph.
Monday
Thunderstorms. High near 73°F. Wind 18 to 21 mph, with gusts as high as 32 mph.
Monday Night
Chance of Showers. Low around 51°F. Wind around 16 mph, with gusts as high as 22 mph.
Tuesday
Mostly Sunny. High near 69°F. Wind 9 to 15 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly Clear. Low around 48°F. Wind around 5 mph, with gusts as high as 8 mph.
Wednesday
Slight Chance of Rain Showers. High near 68°F. Wind 8 to 10 mph, with gusts as high as 15 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 23, 2026

Observation History — Decatur, IL

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
09:35 AM CDT S 12.7 G 16.1 10.00 Clear -- 71.8 60.3 67% NA 71.8 29.92 1013.2
09:15 AM CDT S 9.2 10.00 Clear -- 69.8 59.9 71% NA NA 29.92 1013.2
08:55 AM CDT S 9.2 10.00 Clear -- 68.7 59.7 73% NA NA 29.92 1013.2
08:35 AM CDT S 9.2 10.00 Clear -- 67.1 59.7 77% NA NA 29.93 1013.5
08:15 AM CDT S 8.1 10.00 Clear -- 65.3 59.7 82% NA NA 29.93 1013.5
07:55 AM CDT S 10.3 10.00 Clear -- 62.8 61.0 94% NA NA 29.94 1013.6
07:35 AM CDT S 9.2 10.00 Clear -- 61.0 % NA NA 29.94 1013.9
07:15 AM CDT S 6.9 10.00 Clear -- 59.0 % NA NA 29.94 1013.9
06:55 AM CDT 3.4 10.00 Clear -- 55.9 55.9 100% NA NA 29.94 1013.9
06:35 AM CDT 3.4 10.00 Clear -- 54.7 54.7 100% NA NA 29.94 1013.9
06:15 AM CDT 3.4 7.00 Clear -- 54.1 54.1 100% NA NA 29.94 1013.9
05:55 AM CDT 0.0 10.00 Clear -- 55.0 55.0 100% NA NA 29.94 1013.6
05:35 AM CDT 0.0 10.00 Clear -- 55.6 55.6 100% NA NA 29.94 1013.6
05:15 AM CDT 3.4 10.00 Clear -- 55.2 55.2 100% NA NA 29.94 1013.6
04:55 AM CDT 0.0 10.00 Clear -- 54.9 54.9 100% NA NA 29.94 1013.6
04:35 AM CDT 0.0 10.00 Clear -- 55.2 55.2 100% NA NA 29.93 1013.5
04:15 AM CDT 0.0 10.00 Clear -- 55.0 55.0 100% NA NA 29.94 1013.9
03:55 AM CDT 0.0 10.00 Clear -- 55.8 55.8 100% NA NA 29.94 1013.9
03:35 AM CDT 0.0 10.00 Clear -- 55.4 55.4 100% NA NA 29.94 1013.9
03:15 AM CDT 0.0 10.00 Clear -- 55.6 55.6 100% NA NA 29.94 1013.9
02:55 AM CDT 0.0 10.00 Clear -- 57.2 57.2 100% NA NA 29.94 1013.9
02:35 AM CDT 0.0 10.00 Clear -- 57.4 57.4 100% NA NA 29.95 1014.2
02:15 AM CDT 0.0 10.00 Clear -- 57.4 57.4 100% NA NA 29.95 1014.2
01:55 AM CDT 0.0 10.00 Clear -- 58.1 58.1 100% NA NA 29.95 1014.2

Regional Weather Observation

LINCOLN (KAAA)

Clear
71.8 F

DECATUR (KDEC)

Clear
73.4 F

SPRINGFIELD (KSPI)

Clear
73.4 F

BLOOMINGTON/NORM (KBMI)

Clear
71.6 F

TAYLORVILLE (KTAZ)

Clear
69.8 F

CHAMPAIGN/URBANA (KCMI)

Clear
73.4 F
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