Expires:202512220600;;994719 FPUS53 KLSX 212259 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 459 PM CST Sun Dec 21 2025 ILZ102-MOZ065-220600- Monroe IL-Jefferson MO- 459 PM CST Sun Dec 21 2025 .TONIGHT...Partly cloudy this evening, then clearing. Lows in the upper 20s. Southeast winds around 5 mph. .MONDAY...Sunny in the morning, then becoming partly sunny. Not as cool with highs in the upper 50s. South winds 5 to 10 mph with gusts up to 20 mph. .MONDAY NIGHT...Mostly cloudy in the evening, then clearing. Not as cool. Near steady temperature in the upper 40s. Southwest winds 5 to 10 mph. .TUESDAY...Sunny. Not as cool with highs in the upper 60s. West winds around 5 mph. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. Lows in the upper 40s. East winds around 5 mph. .WEDNESDAY...Mostly cloudy. Highs in the lower 70s. .WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows in the upper 50s. Highs in the mid 70s. .FRIDAY...Sunny. Highs in the upper 60s. .FRIDAY NIGHT AND SATURDAY...Mostly cloudy. Lows in the upper 40s. Highs in the mid 60s. .SATURDAY NIGHT...Mostly cloudy with a 20 percent chance of rain. Much cooler with lows in the lower 30s. .SUNDAY...Mostly sunny. Much cooler with highs in the lower 40s. $$