O Fallon IL Weather

WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM CST THURSDAY

Includes the Counties: Jefferson, Monroe County Il, St. Clair County Il
Tonight...Occasional snow. Additional snow accumulation around 3 inches. Low around 18. Light wind in the evening becoming southwest around 10 mph after midnight. Chance of snow near 100 percent.
Thursday...Blustery...Cloudy. Snow likely in the morning...Then chance of snow in the afternoon. Blowing and drifting snow through the day. Snow accumulation up to 1 inch. Total snow accumulation 3 to 4 inches. High around 20. West wind 15 to 20 mph with gusts to around 30 mph. Chance of snow 70 percent.
Thursday Night...Bitterly cold. Blustery...Cloudy. Blowing and drifting snow. Chance of flurries. Low around 4. Lowest wind chill readings of around 10 below after midnight. Northwest wind 15 to 20 mph with gusts to around 30 mph.
Friday...Bitterly cold. Blustery. Mostly cloudy. High around 10. Lowest wind chill readings of around 15 below early in the morning. Northwest wind 10 to 15 mph with gusts to around 30 mph.
Friday Night...Bitterly cold. Partly cloudy. Low around zero. Lowest wind chill readings of around 10 below after midnight. Northwest wind around 10 mph.
Saturday...Bitterly cold. Partly cloudy. High around 13.
Saturday Night...Very cold. Partly cloudy. Low around 1.
Sunday...Partly cloudy. High in the mid 20s. Low around 13.
Sunday Night...Partly cloudy. High in the mid 20s. Low around 13.
Monday...Partly sunny. High around 30.
Monday Night...Mostly cloudy. Low around 18. High in the lower 30s.
Tuesday...Mostly cloudy. Low around 18. High in the lower 30s.
Tuesday Night...Partly cloudy. Low in the lower 20s. High in the upper 30s.
Wednesday...Partly cloudy. Low in the lower 20s. High in the upper 30s.