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The sidewalks are scalding. The sun is blinding. It’s over 100 degrees across much of Los Angeles. We’re in the midst of a bona fide heat wave and it’s only June. What the heck is going on?

“Things are definitely out of whack here,” said Bill Patzert, a climatologist at the Jet Propulsion Laboratory. “This heat wave is not only unusual in its intensity, it is potentially deadly.” Angelenos know that a few days of punishing heat each year are part of the bargain of living in this usually temperate city.

It’s time to crank up those air conditioners, because the heat wave has arrived.

All across Southern California, temperatures will crest into the triple digits and likely break records. By Monday, the Inland valleys could see highs greater than 108 and the deserts could see highs greater than 120. The high temperatures have prompted the National Weather Service to put out an excessive heat warning that will last through Monday for coastal areas, Tuesday for the Inland valleys and Wednesday for the mountains and deserts.

A monster heat wave descended on Southern California on Sunday, bringing triple-digit temperatures across a large swath of the region and fueling dangerous fires in Silver Lake and San Diego County.

The Border Fire east of San Diego had burned 1,500 acres, and officials were evacuating the town of Potrero. As of noon, numerous areas had exceeded 100 degrees, including Burbank, Beverly Hills, Woodland Hills, Fullerton, Glendale and Riverside. The 106-degree reading in Burbank set a new record for the day and Woodland Hills tied its record. One National Weather Service weather site showed a 112-degree reading in Beverly Hills.

No place has been hit harder by the California drought than Tulare County in the San Joaquin Valley. By now, most Americans have read or heard stories about residential wells going dry in the county’s rural towns, such as East Porterville, Orosi and Cutler.

But it has remained unclear how water shortages are affecting people in these towns. How do they cope without running water in their kitchens and bathrooms? How has this affected their physical health and mental well-being?

San Diegans reduced water consumption by 26 percent last month, the second straight month of strong conservation throughout the region, the County Water Authority reported today.

The May reduction figure followed a 23 percent cutback in April, compared to the same months in 2013, the baseline used by state water officials.