Alton, Illinois | 10-Day Weather Forecasts & Weekend Weather | WeatherBug
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10 Day Forecast
  • Forecast day icon
    Friday
    Mostly Cloudy
    74°
    Forecast night icon
    Night
    Partly Cloudy
    63°
    Friday 5/3
    Day
    74°
    Mostly Cloudy
    Forecast day icon
    Night
    63°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy. Near steady temperature in the mid 70s. Northeast winds around 5 mph.
    Night Details
    Partly cloudy. Lows around 60. Northeast winds around 5 mph.
  • Forecast day icon
    Saturday
    50% Chance of Storms
    79°
    Forecast night icon
    Night
    70% Chance of Storms
    60°
    Saturday 5/4
    Day
    79°
    50% Chance of Storms
    Forecast day icon
    Night
    60°
    70% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Southeast winds around 5 mph becoming southwest in the afternoon. Chance of rain 50 percent.
    Night Details
    Mostly cloudy. Showers and thunderstorms likely mainly in the evening. Lows in the upper 50s. Northwest winds 5 to 10 mph. Chance of rain 70 percent.
  • Forecast day icon
    Sunday
    50% Chance of Storms
    72°
    Forecast night icon
    Night
    60% Chance of Storms
    63°
    Sunday 5/5
    Day
    72°
    50% Chance of Storms
    Forecast day icon
    Night
    63°
    60% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Partly sunny with a slight chance of thunderstorms. A slight chance of showers in the morning then a chance of showers in the afternoon. Highs in the mid 70s. North winds 5 to 10 mph becoming northeast in the afternoon. Chance of rain 50 percent.
    Night Details
    A chance of thunderstorms. Showers likely mainly in the evening. Lows in the lower 60s. Chance of rain 60 percent.
  • Forecast day icon
    Monday
    70% Chance of Storms
    75°
    Forecast night icon
    Night
    70% Chance of Storms
    66°
    Monday 5/6
    Day
    75°
    70% Chance of Storms
    Forecast day icon
    Night
    66°
    70% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Partly sunny with a chance of thunderstorms. A chance of showers in the morning then showers likely in the afternoon. Highs in the upper 70s. Chance of rain 70 percent.
    Night Details
    Showers likely with a chance of thunderstorms. Lows in the mid 60s. Highs in the mid 80s. Chance of rain 70 percent.
  • Forecast day icon
    Tuesday
    70% Chance of Storms
    82°
    Forecast night icon
    Night
    50% Chance of Storms
    63°
    Tuesday 5/7
    Day
    82°
    70% Chance of Storms
    Forecast day icon
    Night
    63°
    50% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Showers likely with a chance of thunderstorms. Lows in the mid 60s. Highs in the mid 80s. Chance of rain 70 percent.
    Night Details
    Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 50 percent.
  • Forecast day icon
    Wednesday
    60% Chance of Storms
    82°
    Forecast night icon
    Night
    50% Chance of Storms
    66°
    Wednesday 5/8
    Day
    82°
    60% Chance of Storms
    Forecast day icon
    Night
    66°
    50% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Mostly sunny. A chance of showers with a slight chance of thunderstorms in the morning then showers likely with a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 60 percent.
    Night Details
    Partly cloudy with a chance of thunderstorms. A chance of showers. Lows in the lower 60s. Chance of rain 50 percent.
  • Forecast day icon
    Thursday
    30% Chance of Storms
    80°
    Forecast night icon
    Night
    40% Chance of Rain
    58°
    Thursday 5/9
    Day
    80°
    30% Chance of Storms
    Forecast day icon
    Night
    58°
    40% Chance of Rain
    Forecast night icon
    Day Details
    Mostly sunny. A chance of showers with a slight chance of thunderstorms in the afternoon. Highs around 80. Chance of rain 30 percent.
    Night Details
    Mostly clear with a 35% chance for rain and thunderstorms. Low temperature around 58F. Dew point will be around 59F with an average humidity of 81%. Winds will be 8 mph from the NW.
  • Forecast day icon
    Friday
    Sunny
    68°
    Forecast night icon
    Night
    Clear
    51°
    Friday 5/10
    Day
    68°
    Sunny
    Forecast day icon
    Night
    51°
    Clear
    Forecast night icon
    Day Details
    Sunny. High temperature around 68F. Dew point will be around 56F with an average humidity of 73%. Winds will be 12 mph from the NW.
    Night Details
    Clear. Low temperature around 51F. Dew point will be around 51F with an average humidity of 83%. Winds will be 11 mph from the NW.
  • Forecast day icon
    Saturday
    Sunny
    65°
    Forecast night icon
    Night
    Clear
    50°
    Saturday 5/11
    Day
    65°
    Sunny
    Forecast day icon
    Night
    50°
    Clear
    Forecast night icon
    Day Details
    Sunny. High temperature around 65F. Dew point will be around 50F with an average humidity of 70%. Winds will be 11 mph from the NW.
    Night Details
    Clear. Low temperature around 50F. Dew point will be around 49F with an average humidity of 80%. Winds will be 8 mph from the NW.
  • Forecast day icon
    Sunday
    Sunny
    66°
    Forecast night icon
    Night
    Clear
    51°
    Sunday 5/12
    Day
    66°
    Sunny
    Forecast day icon
    Night
    51°
    Clear
    Forecast night icon
    Day Details
    Sunny. High temperature around 66F. Dew point will be around 49F with an average humidity of 67%. Winds will be 7 mph from the NW.
    Night Details
    Clear. Low temperature around 51F. Dew point will be around 50F with an average humidity of 78%. Winds will be 4 mph from the NW.