O'Fallon, Missouri Weather
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Weather Forecast for O'Fallon, Missouri : St. Charles County
Issued: 10:36 pm CDT May 12, 2025 Latitude: 38.8106075 Longitude: -90.6998477 View on Google Maps

MouseOver for Detail Forecast
Tonight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
20% chance of rain on Tonight 30% chance of thunderstorms on Tuesday Sunny on Wednesday Mostly Sunny on Thursday 20% chance of thunderstorms on Friday Sunny on Saturday 20% chance of thunderstorms on Sunday 60% chance of thunderstorms on Monday
Low: 61°F High: 79°F High: 85°F High: 90°F High: 87°F High: 84°F High: 80°F High: 81°F
Low: 61°F Low: 67°F Low: 62°F Low: 60°F Low: 60°F Low: 63°F  
Rain Thunderstorms Sunny Mostly Sunny Thunderstorms Sunny Thunderstorms Thunderstorms
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Current Conditions at
SPIRIT OF ST LOUIS - (KSUS)
64°
Cloudy
Mist
as of 9:54 PM CDST
Rel. Humidity: 100%
Dew Point: 64°F
Visibility: 6 Miles
Pressure: 29.81 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Broken at 2100ft, Broken at 3000ft, Solid Overcast at 3900ft
Current Conditions at
ST CHARLES - (KSET)
64°
Mostly Clear
as of 9:54 PM CDST
Rel. Humidity: 93%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 29.81 in.
Flight Rule: VFR
Wind Data
6 MPH
090° East
Cloud Level(s): Few at 1400ft
Current Conditions at
ST LOUIS - (KSTL)
66°
Cloudy
as of 9:51 PM CDST
Rel. Humidity: 88%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 29.82 in.
Flight Rule: MVFR
Wind Data
7 MPH
110° East
Cloud Level(s): Broken at 2500ft, Solid Overcast at 3200ft
Current Conditions at
LITCHFIELD MUNI ARP - (K3LF)
63°
Clear
as of 10:15 PM CDST
Rel. Humidity: 93%
Dew Point: 61°F
Visibility: 7 Miles
Pressure: 29.85 in.
Flight Rule: VFR
Wind Data
6 MPH
100° East
Cloud Level(s): Clear
20% chance of rain Tonight Tonight... A 20 percent chance of showers before 3am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 61. Calm wind.
30% chance of thunderstorms Tuesday Tuesday... A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Areas of fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 79. Calm wind becoming southeast around 5 mph in the afternoon.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 61. Southeast wind 3 to 5 mph.
Sunny on Wednesday Wednesday... Sunny, with a high near 85. Southeast wind 5 to 10 mph.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 67. Southeast wind around 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 62.
20% chance of thunderstorms Friday Friday... A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 87.
30% chance of thunderstorms Friday Night Friday Night... A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 60.
Sunny on Saturday Saturday... Sunny, with a high near 84.
20% chance of rain Saturday Night Saturday Night... A 20 percent chance of showers. Partly cloudy, with a low around 60.
20% chance of thunderstorms Sunday Sunday... A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
60% chance of thunderstorms Sunday Night Sunday Night... Showers and thunderstorms likely. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
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: 05:53 AM
Sunset: 8:06 PM
Civil Sunrise:05:23 AM
Civil Sunset: 8:35 PM
Nautical Sunrise: 04:46 AM
Nautical Sunset: 9:12 PM
Astro Sunrise: 04:06 AM
Astro Sunset: 9:52 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.