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Areas of morning fog could reduce visibility around Alton and the River Bend on Tuesday, but the day's forecast otherwise calls for mostly sunny skies and a high of 69 degrees. Reduced visibility could affect the morning commute where fog develops. Tuesday offers the warmest afternoon in the five-day outlook, followed by a partly cloudy night with a low of 42.
The dry weather gives way to a rain chance Wednesday, when sunny spells will mix with clouds and a possible thunderstorm into the early afternoon. The high should reach 65 degrees, 4 degrees cooler than Tuesday. Partly cloudy skies and breezy conditions continue Wednesday night, with a low of 41.
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Wednesday's precipitation chance is 55%, and winds will strengthen noticeably compared with Tuesday. West winds near 14 mph could gust to about 35 mph during the day, enough to shift loose outdoor items. Northwest winds near 15 mph continue overnight, with gusts around 29 mph. The forecast calls for about a tenth of an inch of rain, with thunderstorms possible rather than certain.
By Thursday, the more pronounced change will be the cold: a high of 49 would be 16 degrees below Wednesday's. Mostly cloudy skies and north-northwest winds around 15 mph, gusting near 29 mph, will add to the chill. Thursday night remains mostly cloudy and brisk, with a low of 32.
Friday looks chilly with periods of sun and breezy conditions, followed by a clear, cold night. The forecast high is 46, with an overnight low of 27. That drop below freezing could harm tender plants left outdoors.
Saturday brings mostly sunny skies and much lighter winds, though temperatures remain cool with a high of 47. A partly cloudy, cold night follows, with a low of 30.
Get the latest updates on weather conditions here: RiverBender.com/weather.