O'Fallon, Missouri Weather
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Weather Forecast for O'Fallon, Missouri : St. Louis (city) County
Issued: 6:07 pm CDT May 12, 2025 Latitude: 38.6722 Longitude: -90.2295 View on Google Maps

MouseOver for Detail Forecast
Tonight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
40% chance of thunderstorms on Tonight 30% chance of thunderstorms on Tuesday Mostly Sunny on Wednesday Mostly Sunny on Thursday 30% chance of thunderstorms on Friday Sunny on Saturday 20% chance of thunderstorms on Sunday 60% chance of thunderstorms on Monday
Low: 63°F High: 80°F High: 84°F High: 90°F High: 88°F High: 84°F High: 81°F High: 81°F
Low: 62°F Low: 69°F Low: 64°F Low: 63°F Low: 61°F Low: 64°F  
Thunderstorms Thunderstorms Mostly Sunny Mostly Sunny Thunderstorms Sunny Thunderstorms Thunderstorms
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Current Conditions at
EAST ST LOUIS - (KCPS)
66°
Cloudy
Light Rain
as of 7:53 PM CDST
Rel. Humidity: 93%
Dew Point: 64°F
Visibility: 10 Miles
Pressure: 29.79 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Broken at 1000ft, Broken at 6500ft, Solid Overcast at 11000ft
Current Conditions at
ST LOUIS - (KSTL)
68°
Cloudy
Light Rain
as of 7:51 PM CDST
Rel. Humidity: 82%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 29.80 in.
Flight Rule: VFR
Wind Data
7 MPH
080° East
Cloud Level(s): Few at 2700ft, Few at 8000ft, Solid Overcast at 11000ft
Current Conditions at
ALTON - (KALN)
64°
Mostly Cloudy
as of 7:50 PM CDST
Rel. Humidity: 93%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 29.81 in.
Flight Rule: VFR
Wind Data
6 MPH
100° East
Cloud Level(s): Broken at 10000ft
Current Conditions at
ST CHARLES - (KSET)
66°
Cloudy
Light Rain Mist
as of 7:54 PM CDST
Rel. Humidity: 93%
Dew Point: 64°F
Visibility: 6 Miles
Pressure: 29.79 in.
Flight Rule: VFR
Wind Data
5 MPH
080° East
Cloud Level(s): Few at 3200ft, Broken at 8000ft, Solid Overcast at 12000ft
40% chance of thunderstorms Tonight Tonight... A chance of showers and thunderstorms before midnight, then a slight chance of showers. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 63. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
30% chance of thunderstorms Tuesday Tuesday... A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind becoming south around 6 mph in the afternoon.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 62. South wind 3 to 5 mph.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 84. Light southeast wind increasing to 5 to 9 mph in the morning.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 69. Southeast wind 6 to 8 mph.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 90.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 64.
30% chance of thunderstorms Friday Friday... A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 88.
30% chance of thunderstorms Friday Night Friday Night... A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 63.
Sunny on Saturday Saturday... Sunny, with a high near 84.
20% chance of thunderstorms Saturday Night Saturday Night... A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61.
20% chance of thunderstorms Sunday Sunday... A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
50% chance of thunderstorms Sunday Night Sunday Night... A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
60% chance of thunderstorms Monday Monday... Showers and thunderstorms likely. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Current Radar Image


Sun Almanac for O'Fallon, Missouri
Sunrise: 05:51 AM
Sunset: 8:03 PM
Civil Sunrise:05:21 AM
Civil Sunset: 8:33 PM
Nautical Sunrise: 04:45 AM
Nautical Sunset: 9:10 PM
Astro Sunrise: 04:05 AM
Astro Sunset: 9:49 PM
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