Mother Nature Delivers Warm Christmas Temps News | December 24, 2023 | 0 | by Morgan McCarthy Sunday could turn out to be the second-hottest Christmas Eve ever in southern Wisconsin. Forecasters say morning lows will dip down only to the low to mid-40s. This afternoon should be mostly cloudy, breezy, and warm as temperatures across most of southern Wisconsin climb up to the low to mid 50s. The National Weather Service says Christmas Eve and Christmas Day will be within the top ten warmest on record. CLICK HERE FOR A WEAU FIRST ALERT FORECAST.