AccuWeather meteorologists predict Las Vegas could see temperatures rise to 104 degrees Fahrenheit, breaking a record of 103 set in 1978, the outlet said. The weather service has an even hotter outlook, warning temperatures in the greater Las Vegas area could reach as high as 108 degrees Fahrenheit.

Spiking temperatures added to the challenges facing firefighters struggling to contain a stubborn Southern California wildfire, as the total acres burned in the state this year surpassed 1 million.

A few hours away in the Bay Area, San Francisco is poised to hit 90 degrees on Tuesday, but unlikely to break any records (the record is 97 degrees). If the city reaches this point, it will be the hottest temperature recorded so far this year.