O'Fallon, Illinois | 10-Day Weather Forecasts & Weekend Weather | WeatherBug
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10 Day Forecast
  • Forecast day icon
    Thursday
    Sunny
    62°
    Forecast night icon
    Night
    Partly Cloudy
    43°
    Thursday 3/28
    Day
    62°
    Sunny
    Forecast day icon
    Night
    43°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Sunny and not as cool. Near steady temperature in the mid 60s. Southwest winds around 10 mph with gusts up to 20 mph.
    Night Details
    Mostly clear in the evening then becoming partly cloudy. Not as cool with lows in the mid 40s. Southwest winds 5 to 10 mph.
  • Forecast day icon
    Friday
    Mostly Sunny
    69°
    Forecast night icon
    Night
    40% Chance Rain Showers
    58°
    Friday 3/29
    Day
    69°
    Mostly Sunny
    Forecast day icon
    Night
    58°
    40% Chance Rain Showers
    Forecast night icon
    Hourly
    Day Details
    Mostly sunny. Highs in the lower 70s. South winds 15 to 20 mph with gusts up to 30 mph.
    Night Details
    Partly cloudy in the evening then becoming mostly cloudy. A 40 percent chance of showers. Not as cool with lows in the upper 50s. South winds 15 to 20 mph with gusts up to 30 mph.
  • Forecast day icon
    Saturday
    Partly Sunny
    74°
    Forecast night icon
    Night
    50% Chance of Storms
    56°
    Saturday 3/30
    Day
    74°
    Partly Sunny
    Forecast day icon
    Night
    56°
    50% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Partly sunny. A slight chance of rain in the afternoon. Highs in the mid 70s. West winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent.
    Night Details
    Mostly cloudy with a chance of rain with a slight chance of thunderstorms. Lows in the mid 50s. Chance of rain 50 percent.
  • Forecast day icon
    Sunday
    50% Chance of Storms
    76°
    Forecast night icon
    Night
    50% Chance of Storms
    62°
    Sunday 3/31
    Day
    76°
    50% Chance of Storms
    Forecast day icon
    Night
    62°
    50% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy. A chance of rain and thunderstorms. Highs in the upper 70s. Lows in the lower 60s. Chance of rain 50 percent.
    Night Details
    Mostly cloudy. A chance of rain and thunderstorms. Highs in the upper 70s. Lows in the lower 60s. Chance of rain 50 percent.
  • Forecast day icon
    Monday
    70% Chance of Storms
    76°
    Forecast night icon
    Night
    70% Chance of Storms
    56°
    Monday 4/1
    Day
    76°
    70% Chance of Storms
    Forecast day icon
    Night
    56°
    70% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Rain likely with a chance of thunderstorms. Highs in the mid 70s. Lows in the lower 50s. Chance of rain 70 percent.
    Night Details
    Rain likely with a chance of thunderstorms. Highs in the mid 70s. Lows in the lower 50s. Chance of rain 70 percent.
  • Forecast day icon
    Tuesday
    Partly Sunny
    61°
    Forecast night icon
    Night
    Partly Cloudy
    43°
    Tuesday 4/2
    Day
    61°
    Partly Sunny
    Forecast day icon
    Night
    43°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Partly sunny. A slight chance of rain and thunderstorms in the morning. Cooler with highs in the lower 60s. Chance of rain 20 percent.
    Night Details
    Partly cloudy in the evening then clearing. Cooler with lows in the upper 30s.
  • Forecast day icon
    Wednesday
    Sunny
    59°
    Forecast night icon
    Night
    Clear
    40°
    Wednesday 4/3
    Day
    59°
    Sunny
    Forecast day icon
    Night
    40°
    Clear
    Forecast night icon
    Day Details
    Sunny. Highs in the upper 50s.
    Night Details
    Clear. Low temperature around 40F. Dew point will be around 33F with an average humidity of 59%. Winds will be 8 mph from the NW.
  • Forecast day icon
    Thursday
    Sunny
    69°
    Forecast night icon
    Night
    Clear
    45°
    Thursday 4/4
    Day
    69°
    Sunny
    Forecast day icon
    Night
    45°
    Clear
    Forecast night icon
    Day Details
    Sunny. High temperature around 69F. Dew point will be around 35F with an average humidity of 45%. Winds will be 4 mph from the SW.
    Night Details
    Clear. Low temperature around 45F. Dew point will be around 39F with an average humidity of 61%. Winds will be 3 mph from the S.
  • Forecast day icon
    Friday
    Sunny
    70°
    Forecast night icon
    Night
    Mostly Clear
    50°
    Friday 4/5
    Day
    70°
    Sunny
    Forecast day icon
    Night
    50°
    Mostly Clear
    Forecast night icon
    Day Details
    Sunny. High temperature around 70F. Dew point will be around 41F with an average humidity of 51%. Winds will be 7 mph from the S.
    Night Details
    Mostly clear. Low temperature around 50F. Dew point will be around 44F with an average humidity of 66%. Winds will be 6 mph from the SE.
  • Forecast day icon
    Saturday
    Mostly Sunny
    71°
    Forecast night icon
    Night
    30% Chance of Rain
    49°
    Saturday 4/6
    Day
    71°
    Mostly Sunny
    Forecast day icon
    Night
    49°
    30% Chance of Rain
    Forecast night icon
    Day Details
    Mostly sunny. High temperature around 71F. Dew point will be around 47F with an average humidity of 57%. Winds will be 9 mph from the S.
    Night Details
    Clear with a slight chance of rain. Chance of precipitation 25%. Low temperature around 49F. Dew point will be around 46F with an average humidity of 69%. Winds will be 3 mph from the S.