(Bloomberg) – The hottest weather in decades gripped parts of Southern California and the Southwest for a second day Monday as utilities urged customers to conserve power and cities opened public pools and cooling centers to people desperate for relief.

At least four hikers died in Arizona, where on Sunday Phoenix set a record for the date of 118 degrees Fahrenheit (48 Celsius), AccuWeather Inc. reported. More of the same was forecast for Monday. It was 109 in Burbank, California, on Sunday, besting the mark set in 1973, and temperatures there reached 106 before noon Monday, the first day of summer.

The National Weather Service posted excessive heat warnings across Southern California, southern Arizona and into central Utah. The heat was forecast to begin tapering off tomorrow.

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