7-Day Forecast Summary
7-Day Detailed Weather Forecast for Alton
Overnight |
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Temperature: 67°F Wind Speed: 5 to 10 mph Wind Direction: NE Forecast: Showers and thunderstorms. Some of the storms could be severe and produce heavy rain. Cloudy, with a low around 67. Northeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible. |
Friday |
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Temperature: 88°F Wind Speed: 5 to 10 mph Wind Direction: S Forecast: Showers and thunderstorms likely before 9am, then a slight chance of showers and thunderstorms between 9am and 2pm, then a chance of showers and thunderstorms between 2pm and 4pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. South wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible. |
Friday Night |
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Temperature: 66°F Wind Speed: 5 to 10 mph Wind Direction: SE Forecast: Showers and thunderstorms likely before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Southeast wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible. |
Independence Day |
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Temperature: 85°F Wind Speed: 5 mph Wind Direction: NNW Forecast: A slight chance of showers and thunderstorms before 8am. Partly sunny, with a high near 85. North northwest wind around 5 mph. Chance of precipitation is 20%. |
Saturday Night |
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Temperature: 63°F Wind Speed: 0 to 5 mph Wind Direction: NNE Forecast: Partly cloudy, with a low around 63. North northeast wind 0 to 5 mph. |
Sunday |
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Temperature: 86°F Wind Speed: 0 to 5 mph Wind Direction: NNE Forecast: Mostly sunny, with a high near 86. North northeast wind 0 to 5 mph. |
Sunday Night |
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Temperature: 63°F Wind Speed: 0 to 5 mph Wind Direction: ENE Forecast: Mostly clear, with a low around 63. |
Monday |
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Temperature: 86°F Wind Speed: 0 to 5 mph Wind Direction: SE Forecast: Sunny, with a high near 86. |
Monday Night |
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Temperature: 64°F Wind Speed: 0 to 5 mph Wind Direction: SE Forecast: Mostly clear, with a low around 64. |
Tuesday |
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Temperature: 87°F Wind Speed: 0 to 5 mph Wind Direction: SSE Forecast: Mostly sunny, with a high near 87. |
Tuesday Night |
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Temperature: 66°F Wind Speed: 5 mph Wind Direction: SE Forecast: A slight chance of rain showers after 1am. Partly cloudy, with a low around 66. |
Wednesday |
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Temperature: 88°F Wind Speed: 5 to 10 mph Wind Direction: SSE Forecast: A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. |
Wednesday Night |
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Temperature: 67°F Wind Speed: 5 to 10 mph Wind Direction: SSW Forecast: A chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Partly cloudy, with a low around 67. Chance of precipitation is 60%. |
Thursday |
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Temperature: 87°F Wind Speed: 5 to 10 mph Wind Direction: W Forecast: Showers and thunderstorms likely before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 60%. |

