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Alton, IL
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7-Day Forecast
Tonight
Chance T-storms
Low: 56°
A chance of showers and thunderstorms before 4am,
then a slight chance of showers.
Mostly cloudy with a low around 56.
Southeast wind 7 to 10 mph.
Chance of precipitation is 40%.
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Friday
Mostly Sunny then Mostly Sunny and Breezy
High: 81°
Mostly sunny with a high near 81.
Breezy with a southwest wind 7 to 12 mph increasing
to 15 to 20 mph in the afternoon.
Winds could gust as high as 32 mph.
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Friday Night
Mostly Cloudy then Slight Chance Showers
Low: 59°
A 20% chance of showers after 4am.
Mostly cloudy with a low around 59.
South wind 9 to 13 mph
with gusts as high as 24 mph.
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Saturday
Showers Likely
High: 73°
Showers likely with thunderstorms also possible after 4pm.
Mostly cloudy with a high near 73.
South wind 9 to 16 mph
with gusts as high as 25 mph.
Chance of precipitation is 60%.
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Saturday Night
Chance T-storms
Low: 63°
A 50% chance of showers and thunderstorms.
Mostly cloudy with a low around 63.
South wind 10 to 14 mph
with gusts as high as 22 mph.
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Sunday
Rain
High: 75°
Rain and possibly a thunderstorm.
High near 75.
Chance of precipitation is 90%.
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Sunday Night
Rain Likely
Low: 40°
Rain likely and possibly a thunderstorm before 1am,
then a slight chance of rain and thunderstorms after 1am.
Mostly cloudy with a low around 40.
Chance of precipitation is 60%.
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Monday
Partly Sunny
High: 53°
Partly sunny with a high near 53.
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Monday Night
Partly Cloudy
Low: 35°
Partly cloudy with a low around 35.
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Tuesday
Mostly Sunny
High: 60°
Mostly sunny with a high near 60.
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Tuesday Night
Slight Chance Rain then Chance Rain
Low: 50°
A 50% chance of rain.
Mostly cloudy with a low around 50.
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Wednesday
Rain Likely
High: 74°
Rain likely and possibly a thunderstorm.
Partly sunny with a high near 74.
Chance of precipitation is 70%.
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Wednesday Night
Rain Likely
Low: 52°
Rain likely.
Mostly cloudy with a low around 52.
Chance of precipitation is 60%.
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Thursday
Chance Rain
High: 70°
A 40% chance of rain.
Partly sunny with a high near 70.
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Source: National Weather Service
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