St. Louis, MO – A strong cold front moving through the region Sunday night will bring a dramatic drop in temperatures, marking a sharp return to winter conditions for the start of the workweek.
According to the National Weather Service in St. Louis, temperatures Sunday afternoon will remain unseasonably mild before falling more than 40 degrees by Monday morning. The rapid cooldown will occur as colder air pours in behind the front, making it feel much more like winter across eastern Missouri and southwest Illinois.
Forecast data shows temperatures peaking Sunday before plunging overnight, with morning lows Monday dropping into the 20s. Daytime highs Monday are expected to remain well below normal, and chilly conditions will persist into Tuesday before a gradual moderation later in the week.
While the temperature drop itself is the primary concern, the sudden change may catch some residents off guard. The National Weather Service cautions that rapid cooling can increase the risk of slick spots on roads if any moisture remains, especially on bridges and elevated surfaces. Gusty winds behind the front may also add to the chill, making outdoor conditions feel colder than temperatures alone suggest.
Residents are encouraged to prepare for the abrupt change by dressing in layers, protecting sensitive plants, and checking on outdoor pets and livestock. Those with exposed pipes in vulnerable locations may also want to take precautions as temperatures fall overnight.
Commuters heading out early Monday morning should plan for winter-like conditions and allow extra time, particularly if temperatures drop faster than expected.
The National Weather Service advises monitoring forecast updates through the weekend, as exact timing and temperature values may continue to be refined as the cold front approaches.
