Unseasonably Cool in the Ohio Valley and Northeast to Begin the Holiday Weekend

A strong cold front has dropped temperatures sharply across the Ohio Valley and Northeast. Temperatures will be 10-20 degrees below normal through Saturday, with gusty winds and showers. A large part of the Ohio Valley and Northeast will see freezing temperatures Friday night into Saturday morning. Temperatures will begin to rebound on Sunday, but will remain below normal through the holiday.
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O'Fallon IL

Tonight

Mostly Clear

Mostly
Clear

Low: 46 °F

Saturday

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

High: 71 °F

Saturday
Night

Thunderstorms Likely Chance for Measurable Precipitation 60%

Thunderstorms
Likely

Low: 55 °F

Sunday

Chance Thunderstorms Chance for Measurable Precipitation 50%

Chance
Thunderstorms

High: 75 °F

Sunday
Night

Chance Thunderstorms Chance for Measurable Precipitation 50%

Chance
Thunderstorms

Low: 61 °F

Memorial
Day

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

High: 80 °F

Monday
Night

Partly Cloudy

Partly
Cloudy

Low: 64 °F

Tuesday

Mostly Sunny

Mostly
Sunny

High: 84 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 66 °F

Hazardous Weather Conditions

7-DAY FORECAST

  • Tonight Mostly clear, with a low around 46. Light east wind.
  • Saturday A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 71. Light east wind becoming southeast 5 to 10 mph in the morning.
  • Saturday Night Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 55. Southeast wind around 9 mph. Chance of precipitation is 60%.
  • Sunday A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 75. South wind 8 to 11 mph.
  • Sunday Night A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61. South wind around 10 mph.
  • Memorial Day A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
  • Monday Night Partly cloudy, with a low around 64.
  • Tuesday Mostly sunny, with a high near 84.
  • Tuesday Night Partly cloudy, with a low around 66.
  • Wednesday Mostly sunny, with a high near 86.
  • Wednesday Night Partly cloudy, with a low around 67.
  • Thursday Mostly sunny, with a high near 87.
  • Thursday Night Mostly cloudy, with a low around 67.
  • Friday Partly sunny, with a high near 85.

 

ADDITIONAL FORECASTS AND INFORMATION

Zone Area Forecast for St. Clair County, IL