December heat: Las Vegas breaks daily heat record

Southern Nevada has moved beyond “unreasonable warmth” and into record-breaking territory, after Las Vegas officially hit 74 degrees Thursday, according to the National Weather Service.

In a post to X the NWS said the temperature breaks the previous daily record of 72 degrees, set in 1939, and that its still possible the city could climb another degree or two.

Las Vegas has officially reached 74 degrees. This breaks the previous daily record of 72 degrees set in 1939. It is still possible that we could jump another 1-2 degrees. The all-time December high temp is 78 degrees set on 12/2/1940. #nvwx #vegasweather

— NWS Las Vegas (@NWSVegas) December 11, 2025

The all-time December high in Las Vegas is 78 degrees, set on Dec. 2, 1940, the weather service noted.

Highs the rest of the week are still expected to run 10 to 15 degrees above normal, said Morgan Stessman of the NWS on Wednesday. Forecast highs remain in the low to mid-70s across most of the Las Vegas Valley, with overnight lows in the upper 40s to low 50s. The calm and unusually warm December pattern is “going to stick around” for perhaps the next two weeks, she said.