7-Day Forecast Summary
7-Day Detailed Weather Forecast for Alton
This Afternoon |
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Temperature: 82°F Wind Speed: 0 to 5 mph Wind Direction: WNW Forecast: Sunny, with a high near 82. West northwest wind 0 to 5 mph. |
Tonight |
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Temperature: 57°F Wind Speed: 0 mph Wind Direction: Forecast: Mostly clear, with a low around 57. South southeast wind around 0 mph. |
Friday |
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Temperature: 83°F Wind Speed: 0 to 15 mph Wind Direction: S Forecast: A slight chance of showers and thunderstorms before 10am. Mostly sunny, with a high near 83. South wind 0 to 15 mph. Chance of precipitation is 20%. |
Friday Night |
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Temperature: 67°F Wind Speed: 10 to 15 mph Wind Direction: SSE Forecast: A chance of showers and thunderstorms between 7pm and 3am, then showers and thunderstorms likely. Mostly cloudy, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. |
Saturday |
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Temperature: 87°F Wind Speed: 10 to 20 mph Wind Direction: S Forecast: A chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87. South wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%. |
Saturday Night |
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Temperature: 72°F Wind Speed: 10 mph Wind Direction: S Forecast: Partly cloudy, with a low around 72. South wind around 10 mph. |
Sunday |
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Temperature: 90°F Wind Speed: 5 to 10 mph Wind Direction: S Forecast: Mostly sunny, with a high near 90. |
Sunday Night |
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Temperature: 71°F Wind Speed: 5 mph Wind Direction: SSW Forecast: Partly cloudy, with a low around 71. |
Monday |
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Temperature: 87°F Wind Speed: 5 mph Wind Direction: SW Forecast: A slight chance of rain showers between 7am and 1pm. Partly sunny, with a high near 87. |
Monday Night |
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Temperature: 66°F Wind Speed: 0 to 5 mph Wind Direction: ESE Forecast: A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66. Chance of precipitation is 40%. |
Tuesday |
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Temperature: 85°F Wind Speed: 0 to 5 mph Wind Direction: SE Forecast: A chance of showers and thunderstorms before 7am. Partly sunny, with a high near 85. Chance of precipitation is 40%. |
Tuesday Night |
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Temperature: 66°F Wind Speed: 0 to 5 mph Wind Direction: E Forecast: A chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 66. Chance of precipitation is 30%. |
Wednesday |
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Temperature: 87°F Wind Speed: 0 to 5 mph Wind Direction: SSE Forecast: A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 87. Chance of precipitation is 30%. |
Wednesday Night |
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Temperature: 68°F Wind Speed: 5 mph Wind Direction: S Forecast: A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 68. |

