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Day 1 Outlook • April 17, 2026
Day 2 Outlook • April 18, 2026
Day 3 Outlook • April 19, 2026
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dBZ 5
75

Hazardous Weather Conditions

  • No active alerts for WATERLOO, ILLINOIS

Current Conditions: WATERLOO, ILLINOIS

CAHOKIA/ST LOUIS (KCPS)

Clear

66.2 F
Humidity:83%
Wind Speed:S 6.9 mph
Barometer:29.92 in
Dewpoint:60.8 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 17 2026, 08:35 AM CDT
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5 Day Forecast for WATERLOO, ILLINOIS (62298)

Friday

High 84 °F
Chance of T-storms
Friday
Night
Low 50 °F
T-storms
Saturday

High 60 °F
Chance of Rain Showers
Saturday
Night
Low 39 °F
Mostly Clear
Sunday

High 66 °F
Sunny
Sunday
Night
Low 41 °F
Clear
Monday

High 73 °F
Sunny
Monday
Night
Low 53 °F
Mostly Clear
Tuesday

High 77 °F
Partly Sunny

Detailed Forecast for WATERLOO, ILLINOIS (62298)

Friday
Chance of Thunderstorms. High near 84°F. Wind 8 to 15 mph, with gusts as high as 25 mph.
Friday Night
Thunderstorms. Low around 50°F. Wind 12 to 14 mph, with gusts as high as 23 mph.
Saturday
Chance of Rain Showers. High near 60°F. Wind 12 to 16 mph, with gusts as high as 25 mph.
Saturday Night
Mostly Clear. Low around 39°F. Wind 6 to 9 mph, with gusts as high as 15 mph.
Sunday
Sunny. High near 66°F. Wind 6 to 12 mph, with gusts as high as 20 mph.
Sunday Night
Clear. Low around 41°F. Wind around 3 mph, with gusts as high as 8 mph.
Monday
Sunny. High near 73°F. Wind 7 to 8 mph, with gusts as high as 14 mph.
Monday Night
Mostly Clear. Low around 53°F. Wind around 9 mph, with gusts as high as 16 mph.
Tuesday
Partly Sunny. High near 77°F. Wind 9 to 13 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly Clear. Low around 55°F. Wind around 8 mph, with gusts as high as 15 mph.
Wednesday
Partly Sunny. High near 78°F. Wind 7 to 9 mph, with gusts as high as 15 mph.
Wednesday Night
Partly Cloudy. Low around 57°F. Wind around 7 mph, with gusts as high as 13 mph.
Thursday
Chance of Scattered Thunderstorms. High near 78°F. Wind 10 to 12 mph, with gusts as high as 18 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 17, 2026

Observation History for WATERLOO, ILLINOIS

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)
08:35 AM CDT S 6.9 10.00 Clear -- 66.2 60.8 83% NA NA 29.92 1013.2
08:25 AM CDT S 4.6 10.00 Mostly Clear -- 64.4 60.8 88% NA NA 29.92 1013.2
08:10 AM CDT 10.00 Mostly Clear -- 64.4 59.0 83% NA NA 29.92 1013.2
08:05 AM CDT 5.7 10.00 Mostly Clear -- 64.4 59.0 83% NA NA 29.92 1013.2
07:50 AM CDT 5.7 10.00 Clear -- 62.6 59.0 88% NA NA 29.92 1013.2
07:10 AM CDT S 3.4 10.00 Mostly Clear -- 60.8 57.2 88% NA NA 29.92 1013.2
07:00 AM CDT 4.6 10.00 Mostly Clear -- 60.8 57.2 88% NA NA 29.92 1013.2
06:50 AM CDT 4.6 10.00 Mostly Clear -- 60.8 57.2 88% NA NA 29.92 1013.2
06:35 AM CDT 4.6 10.00 Clear -- 60.8 57.2 88% NA NA 29.92 1013.2
06:20 AM CDT 4.6 10.00 Clear -- 60.8 57.2 88% NA NA 29.91 1012.9
06:10 AM CDT 5.7 10.00 Clear -- 60.8 57.2 88% NA NA 29.91 1012.9
06:05 AM CDT 5.7 10.00 Clear -- 60.8 57.2 88% NA NA 29.91 1012.9
05:45 AM CDT 4.6 10.00 Clear -- 60.8 57.2 88% NA NA 29.91 1012.9
05:35 AM CDT 5.7 10.00 Clear -- 60.8 57.2 88% NA NA 29.91 1012.9
05:20 AM CDT S 4.6 10.00 Clear -- 60.8 57.2 88% NA NA 29.91 1012.9
05:10 AM CDT 5.7 10.00 Clear -- 60.8 57.2 88% NA NA 29.91 1012.9
04:55 AM CDT 0.0 10.00 Clear -- 60.8 59.0 94% NA NA 29.91 1012.9
04:50 AM CDT 0.0 10.00 Clear -- 60.8 59.0 94% NA NA 29.91 1012.9
04:30 AM CDT 0.0 10.00 Clear -- 62.6 59.0 88% NA NA 29.90 1012.5
04:15 AM CDT 4.6 10.00 Clear -- 60.8 59.0 94% NA NA 29.90 1012.5
04:10 AM CDT 4.6 10.00 Clear -- 60.8 59.0 94% NA NA 29.90 1012.5
04:00 AM CDT 4.6 10.00 Clear -- 60.8 59.0 94% NA NA 29.90 1012.5
03:40 AM CDT S 5.7 10.00 Clear -- 62.6 60.8 94% NA NA 29.91 1012.9
03:35 AM CDT 5.7 10.00 Mostly Clear -- 62.6 60.8 94% NA NA 29.90 1012.5

Regional Weather Observation

CAHOKIA/ST LOUIS (KCPS)

Clear
66.2 F

ST LOUIS (KSTL)

Clear
68.0 F

ST LOUIS/SPIRIT (KSUS)

Mostly Clear
69.8 F

ALTON/ST LOUIS R (KALN)

Partly Cloudy
64.4 F

ST CHARLES (KSET)

Clear
68.0 F

SCOTT AFB/BELLEV (KBLV)

Mostly Cloudy
64.0 F
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