O'Fallon, Missouri | 10-Day Weather Forecasts & Weekend Weather | WeatherBug
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10 Day Forecast
  • Forecast day icon
    Thursday
    Thunderstorms
    83°
    Forecast night icon
    Night
    Thunderstorms
    47°
    Thursday 4/18
    Day
    83°
    Thunderstorms
    Forecast day icon
    Night
    47°
    Thunderstorms
    Forecast night icon
    Hourly
    Day Details
    Mostly sunny this morning then showers with thunderstorms likely this afternoon. Locally heavy rainfall possible this afternoon. Highs around 80. Southeast winds 10 to 15 mph becoming south this afternoon. Gusts up to 30 mph. Chance of rain near 100 percent.
    Night Details
    Showers with thunderstorms likely in the evening then partly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Cooler with lows in the mid 40s. Northwest winds 15 to 20 mph with gusts up to 30 mph. Chance of rain near 100 percent.
  • Forecast day icon
    Friday
    Mostly Sunny
    62°
    Forecast night icon
    Night
    Mostly Cloudy
    45°
    Friday 4/19
    Day
    62°
    Mostly Sunny
    Forecast day icon
    Night
    45°
    Mostly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Mostly sunny. Much cooler with highs around 60. North winds 10 to 15 mph.
    Night Details
    Mostly cloudy. Lows in the mid 40s. North winds 5 to 10 mph.
  • Forecast day icon
    Saturday
    Mostly Sunny
    61°
    Forecast night icon
    Night
    Partly Cloudy
    41°
    Saturday 4/20
    Day
    61°
    Mostly Sunny
    Forecast day icon
    Night
    41°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Mostly sunny. Highs in the lower 60s. North winds 10 to 15 mph.
    Night Details
    Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 30s.
  • Forecast day icon
    Sunday
    Mostly Sunny
    62°
    Forecast night icon
    Night
    Mostly Clear
    41°
    Sunday 4/21
    Day
    62°
    Mostly Sunny
    Forecast day icon
    Night
    41°
    Mostly Clear
    Forecast night icon
    Hourly
    Day Details
    Mostly clear. Highs around 60. Lows in the upper 30s.
    Night Details
    Mostly clear. Highs around 60. Lows in the upper 30s.
  • Forecast day icon
    Monday
    Sunny
    70°
    Forecast night icon
    Night
    Mostly Cloudy
    55°
    Monday 4/22
    Day
    70°
    Sunny
    Forecast day icon
    Night
    55°
    Mostly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Sunny. Highs in the upper 60s.
    Night Details
    Mostly cloudy with a 20 percent chance of showers. Not as cool with lows in the lower 50s.
  • Forecast day icon
    Tuesday
    40% Chance of Storms
    69°
    Forecast night icon
    Night
    Partly Cloudy
    46°
    Tuesday 4/23
    Day
    69°
    40% Chance of Storms
    Forecast day icon
    Night
    46°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 40 percent.
    Night Details
    Partly cloudy. A 20 percent chance of showers. Lows in the upper 40s. Highs around 70.
  • Forecast day icon
    Wednesday
    Partly Cloudy
    68°
    Forecast night icon
    Night
    30% Chance of Rain
    54°
    Wednesday 4/24
    Day
    68°
    Partly Cloudy
    Forecast day icon
    Night
    54°
    30% Chance of Rain
    Forecast night icon
    Day Details
    Partly cloudy. A 20 percent chance of showers. Lows in the upper 40s. Highs around 70.
    Night Details
    Partly cloudy with a slight chance of rain. Chance of precipitation 25%. Low temperature around 54F. Dew point will be around 45F with an average humidity of 63%. Winds will be 7 mph from the E.
  • Forecast day icon
    Thursday
    40% Chance of Rain
    74°
    Forecast night icon
    Night
    40% Chance of Rain
    56°
    Thursday 4/25
    Day
    74°
    40% Chance of Rain
    Forecast day icon
    Night
    56°
    40% Chance of Rain
    Forecast night icon
    Day Details
    Mostly cloudy with a chance of rain. Chance of precipitation 35%. High temperature around 74F. Dew point will be around 54F with an average humidity of 62%. Winds will be 6 mph from the SW.
    Night Details
    Partly cloudy with a chance of rain. Chance of precipitation 40%. Low temperature around 56F. Dew point will be around 52F with an average humidity of 68%. Winds will be 4 mph from the SW.
  • Forecast day icon
    Friday
    50% Chance of Rain
    74°
    Forecast night icon
    Night
    50% Chance of Rain
    56°
    Friday 4/26
    Day
    74°
    50% Chance of Rain
    Forecast day icon
    Night
    56°
    50% Chance of Rain
    Forecast night icon
    Day Details
    Partly cloudy with a chance of rain. Chance of precipitation 45%. High temperature around 74F. Dew point will be around 52F with an average humidity of 59%. Winds will be 5 mph from the W.
    Night Details
    Partly cloudy with a chance of rain. Chance of precipitation 50%. Low temperature around 56F. Dew point will be around 50F with an average humidity of 66%. Winds will be 3 mph from the NW.
  • Forecast day icon
    Saturday
    50% Chance of Rain
    74°
    Forecast night icon
    Night
    60% Chance of Rain
    55°
    Saturday 4/27
    Day
    74°
    50% Chance of Rain
    Forecast day icon
    Night
    55°
    60% Chance of Rain
    Forecast night icon
    Day Details
    Partly cloudy with a chance of rain. Chance of precipitation 50%. High temperature around 74F. Dew point will be around 52F with an average humidity of 57%. Winds will be 4 mph from the SW.
    Night Details
    Partly cloudy with a chance of rain. Chance of precipitation 55%. Low temperature around 55F. Dew point will be around 49F with an average humidity of 66%. Winds will be 2 mph from the NW.