O Fallon, MO
Overnight: A 30 percent chance of showers and thunderstorms, mainly between 3am and 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 71. Calm wind.
Sunday: Patchy fog before 8am. Otherwise, sunny, with a high near 93. Heat index values as high as 107. Light southeast wind becoming south 5 to 9 mph in the morning.
Monday: Mostly sunny, with a high near 94. Heat index values as high as 107. South wind 6 to 9 mph.
Monday Night: Mostly clear, with a low around 75. South wind 6 to 8 mph.
Tuesday: Sunny, with a high near 95.
Tuesday Night: Clear, with a low around 75.
Wednesday: Sunny, with a high near 95.
Wednesday Night: Mostly clear, with a low around 75.
Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94.
Thursday Night: Partly cloudy, with a low around 74.
Friday: Sunny, with a high near 93.
Friday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74.
Independence Day: A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.
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