St. Clair, MO Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for St. Clair, MO.

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Current Conditions — Saint Clair, MO

WASHINGTON (KFYG)

Haze

60.8 F
Humidity:82%
Wind Speed: 0.0 mph
Barometer:30.08 in
Dewpoint:55.4 F
Visibility:6.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 22 2026, 07:35 AM CDT
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5-Day Forecast — Saint Clair, MO

Wednesday

High 80 °F
Partly Sunny
Wednesday
Night
Low 57 °F
Mostly Clear
Thursday

High 82 °F
Partly Sunny
Thursday
Night
Low 62 °F
T-storms Likely
Friday

High 77 °F
T-storms
Friday
Night
Low 53 °F
Chance of Showers
Saturday

High 77 °F
Slight Chance of Showers
Saturday
Night
Low 53 °F
Slight Chance of Showers
Sunday

High 77 °F
Chance of Scattered T-storms

Detailed Forecast — Saint Clair, MO

Wednesday
Partly Sunny. High near 80°F. Wind 2 to 6 mph, with gusts as high as 15 mph.
Wednesday Night
Mostly Clear. Low around 57°F. Wind 2 to 5 mph, with gusts as high as 15 mph.
Thursday
Partly Sunny. High near 82°F. Wind 6 to 12 mph, with gusts as high as 25 mph.
Thursday Night
Thunderstorms Likely. Low around 62°F. Wind 7 to 8 mph, with gusts as high as 21 mph.
Friday
Thunderstorms. High near 77°F. Wind 3 to 7 mph, with gusts as high as 20 mph.
Friday Night
Chance of Showers. Low around 53°F.
Saturday
Slight Chance of Showers. High near 77°F. Wind 2 to 5 mph, with gusts as high as 13 mph.
Saturday Night
Slight Chance of Showers. Low around 53°F. Wind around 1 mph, with gusts as high as 10 mph.
Sunday
Chance of Scattered Thunderstorms. High near 77°F. Wind 6 to 7 mph, with gusts as high as 18 mph.
Sunday Night
Rain Likely. Low around 59°F. Wind around 6 mph, with gusts as high as 20 mph.
Monday
Thunderstorms Likely. High near 78°F. Wind 7 to 9 mph, with gusts as high as 21 mph.
Monday Night
Partly Cloudy. Low around 50°F. Wind around 5 mph, with gusts as high as 17 mph.
Tuesday
Partly Sunny. High near 71°F. Wind 2 to 6 mph, with gusts as high as 17 mph.
MO Radar
Current Radar • MO
Day 1 Outlook • April 22, 2026

Observation History — Saint Clair, MO

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)
07:35 AM CDT 0.0 6.00 Haze -- 60.8 55.4 82% NA NA 30.08 1018.6
07:15 AM CDT 0.0 1.50 NULL -- 59.0 55.4 88% NA NA 30.07 1018.3
06:55 AM CDT 0.0 1.00 Fog/Mist -- 57.2 53.6 88% NA NA 30.07 1018.3
06:35 AM CDT 0.0 7.00 NULL -- 57.2 53.6 88% NA NA 30.06 1018.0
06:15 AM CDT 0.0 7.00 Clear -- 57.2 53.6 88% NA NA 30.06 1018.0
05:55 AM CDT 0.0 6.00 Fog/Mist -- 57.2 53.6 88% NA NA 30.06 1018.0
05:35 AM CDT 0.0 7.00 Clear -- 59.0 53.6 82% NA NA 30.06 1018.0
05:15 AM CDT 0.0 7.00 Clear -- 60.8 53.6 77% NA NA 30.05 1017.6
04:55 AM CDT 0.0 7.00 Clear -- 59.0 53.6 82% NA NA 30.06 1018.0
04:35 AM CDT 0.0 7.00 Clear -- 60.8 53.6 77% NA NA 30.06 1018.0
04:15 AM CDT 0.0 7.00 NULL -- 62.6 55.4 77% NA NA 30.06 1018.0
03:55 AM CDT 0.0 7.00 Clear -- 62.6 55.4 77% NA NA 30.05 1017.6
03:35 AM CDT 0.0 7.00 Clear -- 62.6 55.4 77% NA NA 30.05 1017.6
03:15 AM CDT 0.0 7.00 Clear -- 62.6 55.4 77% NA NA 30.05 1017.6
02:55 AM CDT 0.0 7.00 Clear -- 62.6 55.4 77% NA NA 30.05 1017.6
02:35 AM CDT 0.0 7.00 Clear -- 62.6 55.4 77% NA NA 30.05 1017.6
02:15 AM CDT 0.0 7.00 Clear -- 62.6 55.4 77% NA NA 30.05 1017.6
01:55 AM CDT 0.0 7.00 Clear -- 64.4 55.4 73% NA NA 30.05 1017.6
01:35 AM CDT 0.0 7.00 Clear -- 64.4 53.6 68% NA NA 30.05 1017.6
01:15 AM CDT 0.0 7.00 Clear -- 66.2 53.6 64% NA NA 30.06 1018.0
12:55 AM CDT 0.0 10.00 Clear -- 64.4 51.8 64% NA NA 30.05 1017.6
12:35 AM CDT 0.0 10.00 Clear -- 66.2 51.8 60% NA NA 30.05 1017.6
12:15 AM CDT 10.00 Clear -- NULL % NA NA M
11:55 PM CDT 0.0 10.00 Clear -- 68.0 50.0 53% NA NA 30.04 1017.3

Regional Weather Observation

WASHINGTON (KFYG)

Haze
60.8 F

VICHY/ROLLA (KVIH)

Clear
53.6 F

ST LOUIS/SPIRIT (KSUS)

Clear
60.8 F

ST LOUIS (KSTL)

Clear
62.6 F

ST CHARLES (KSET)

Clear
60.8 F

CAHOKIA/ST LOUIS (KCPS)

Clear
60.8 F
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