Long Beach is expected to hit 93 degrees today, but it’ll still be cooler than many other areas of Southern California, some of which will be under a heat advisory, warning of the high temperatures.

The heat advisory, signaling “a dangerous situation in which heat illnesses are possible,” will be in effect today in several parts of L.A. County, including the San Fernando and Santa Clarita valleys and the San Gabriel and Santa Monica mountains.

The advisory will be in effect from 11 this morning until 7 tonight, the National Weather Service said.

“Very high temperatures will create a dangerous situation in which heat illnesses are possible,” the weather service said in a statement, adding that temperatures inside vehicles parked in hot weather “can quickly rise to life-threatening levels” even with windows left open, meaning people and pets must not be left in such vehicles.

The NWS also urged area residents to “drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.”

A cool-off is expected next week, but for today the NWS forecast sunny skies highs of 78 degrees in Avalon; 84 at LAX and on Mount Wilson; 91 in Downtown L.A.; 93 in Long Beach; 95 in San Gabriel; 98 in Pasadena and Palmdale; 99 in Burbank; 100 in Lancaster; 102 in Saugus; and 104 in Woodland Hills.

Saturday’s temperatures will be about the same but will decline a few degrees Sunday and several more Monday.