Las Vegas Weather December 2024 Average. In las vegas, during december, the rain falls for 5.1 days and regularly aggregates up to 0.67 (17mm) of precipitation. Get the monthly weather forecast for las vegas, nv, including daily high/low, historical averages, to help you plan ahead.

December is in the winter in las vegas and is typically the coldest month of the year. As the day progresses, temperatures can peak at 13°c.