St. Louis 10-Day Forecast Signals Repeated Cold Surges and Potential Ice Risk Late This Weekend
Overview: A week defined by sharp temperature swings
St. Louis enters the week under very cold conditions, followed by a short-lived warmup and then another extended plunge back into midwinter temperatures. The 10-day outlook points to repeated surges of Arctic air, with the coldest stretch arriving late this week and continuing into next week. A wintry mix is also possible late Sunday, bringing a risk of slick travel and icing.
Day-by-day: From deep freeze to brief thaw, then back again
Monday, Jan. 19: Sunny, breezy, and very cold with a high near 22°F and a low around 15°F.
Tuesday, Jan. 20: A notable rebound—partly sunny and less cold, high about 41°F, low near 33°F.
Wednesday, Jan. 21: Mostly sunny with a high near 44°F; overnight low around 24°F.
Thursday, Jan. 22: Sunny but cooling again—high near 36°F, low around 18°F.
Friday, Jan. 23: Mostly cloudy, breezy, and very cold—high near 22°F, low near 4°F.
Saturday, Jan. 24: Cloudy and bitterly cold—high around 15°F, low near 12°F.
Sunday, Jan. 25: Wintry mix possible—sleet and freezing rain in the afternoon with lingering morning icing concerns; high near 26°F, low around 7°F.
Monday, Jan. 26: Cold but sunnier—high near 24°F, low around 15°F.
Tuesday, Jan. 27: Cold with decreasing clouds—high near 30°F, low around 14°F.
Wednesday, Jan. 28: Very cold with thick cloud cover—high near 20°F, low around 8°F.
What could be impacted
The forecast points to two main concerns: sustained cold and a potential icing window late Sunday. The coldest nighttime readings arrive late this week, dipping to about 4°F early Saturday (following Friday night). Such temperatures can strain home heating systems, increase the risk of frozen pipes in vulnerable properties, and elevate cold exposure risks for anyone spending extended time outdoors.
Late Sunday brings the most notable precipitation risk in the 10-day period, with sleet and freezing rain possible.
If freezing rain develops Sunday afternoon, even light icing can quickly create hazardous conditions on bridges, overpasses, untreated side streets, and sidewalks. Temperatures are expected to remain below freezing for much of that period, which can limit melting and allow ice to persist into the evening and early Monday.
Bottom line
St. Louis is likely to see a brief midweek moderation before a return to prolonged, bitter cold. The period to watch most closely for travel disruption is late Sunday, when sleet and freezing rain could introduce a short but meaningful icing threat.