St. Louis, Missouri – A prolonged blast of arctic air is expected to grip communities along the Missouri–Illinois border late this week, bringing some of the coldest temperatures of the season and creating dangerous conditions across the bi-state region. Overnight lows are expected to drop near 2 degrees below zero, with daytime temperatures struggling to climb out of the single digits through early next week.
According to the National Weather Service, a polar air mass will settle over the Midwest from Saturday through Tuesday, keeping temperatures well below normal for several consecutive days. Gusty northwest winds will drive wind chill values well below zero at times, particularly overnight and during the early morning hours, increasing the risk of frostbite with prolonged exposure.
The cold will be felt across eastern Missouri and southwestern Illinois, including the St. Louis metro area, St. Charles County, Metro East communities, and areas along the Mississippi River. While widespread snowfall is not expected, clear to partly cloudy nights will allow temperatures to drop rapidly, increasing the risk of frozen pipes and placing added strain on heating systems. Refreezing could also create slick spots on bridges and untreated roads along Interstates 64, 70, 55, and local roadways.
Emergency management officials urge residents to limit time outdoors during the coldest periods, dress in multiple warm layers, and ensure pets are brought indoors. Homeowners are advised to protect exposed pipes, while drivers should carry winter emergency kits in case of breakdowns.
The deep freeze is expected to persist through Tuesday, and wind chill advisories or warnings may be issued as conditions remain dangerously cold.
