WPDE – A look back on 2024’s weather in the Carolinas shows it was quite the year!. January saw an average high temperature of around 57 degrees Fahrenheit in Myrtle Beach and 59 degrees Fahrenheit in Florence. The average low temperature in January in Myrtle Beach was 38 degrees Fahrenheit and in Florence, it was 36 degrees Fahrenheit. There were 2 thunderstorm days in the area in January with rainfall totals a tad below normal for the month.