Weather in Alton, Illinois, United States
7-Day Forecast Summary
7-Day Detailed Weather Forecast for Alton
Overnight |
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Temperature: 46°F Wind Speed: 3 mph Wind Direction: SE Forecast: Widespread fog. Mostly cloudy, with a low around 46. Southeast wind around 3 mph. |
Thursday |
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Temperature: 67°F Wind Speed: 5 to 13 mph Wind Direction: S Forecast: Widespread fog before 8am, then thunderstorms likely and rain likely between 9am and noon, then showers and thunderstorms likely between noon and 4pm. Mostly cloudy, with a high near 67. South wind 5 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. |
Thursday Night |
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Temperature: 37°F Wind Speed: 10 to 20 mph Wind Direction: W Forecast: Partly cloudy, with a low around 37. West wind 10 to 20 mph, with gusts as high as 33 mph. |
Friday |
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Temperature: 49°F Wind Speed: 7 to 18 mph Wind Direction: W Forecast: Mostly sunny, with a high near 49. West wind 7 to 18 mph, with gusts as high as 29 mph. |
Friday Night |
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Temperature: 30°F Wind Speed: 6 mph Wind Direction: NW Forecast: Partly cloudy, with a low around 30. Northwest wind around 6 mph. |
Saturday |
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Temperature: 46°F Wind Speed: 5 to 12 mph Wind Direction: NW Forecast: A slight chance of snow between noon and 3pm, then a slight chance of rain and snow. Mostly sunny, with a high near 46. Chance of precipitation is 20%. |
Saturday Night |
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Temperature: 25°F Wind Speed: 12 mph Wind Direction: NW Forecast: Mostly clear, with a low around 25. |
Sunday |
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Temperature: 39°F Wind Speed: 13 to 18 mph Wind Direction: NW Forecast: Sunny, with a high near 39. |
Sunday Night |
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Temperature: 19°F Wind Speed: 13 mph Wind Direction: NW Forecast: Mostly clear, with a low around 19. |
Monday |
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Temperature: 37°F Wind Speed: 7 to 13 mph Wind Direction: NW Forecast: Sunny, with a high near 37. |
Monday Night |
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Temperature: 20°F Wind Speed: 5 mph Wind Direction: W Forecast: Mostly clear, with a low around 20. |
Tuesday |
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Temperature: 51°F Wind Speed: 5 to 15 mph Wind Direction: S Forecast: Mostly sunny, with a high near 51. |
Tuesday Night |
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Temperature: 39°F Wind Speed: 14 mph Wind Direction: S Forecast: Mostly cloudy, with a low around 39. |
Wednesday |
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Temperature: 60°F Wind Speed: 12 to 15 mph Wind Direction: SW Forecast: Mostly cloudy, with a high near 60. |