"It's going to be a hot weekend," he said. "But we've done this before, even during COVID times. So we know how to run them and make sure we have enough places for people to come out and get cool."
People are also urged to check on those who are vulnerable, including older friends and neighbors, children and pets.
"High temperatures are not just an inconvenience, they can be dangerous and even deadly," Dr. Muntu Davis, L.A. County health officer, said in a statement.
Another concern is the possibility of fire. The National Weather Service has issued a red-flag warning, which indicates critical fire weather conditions, for the valleys and mountains of Southern California that will be in effect from 6 p.m. Sunday to 10 p.m. Monday, Sweet said.
In addition to the heat, relative humidities are expected to drop down into the single digits Sunday afternoon, with little recovery overnight.
In Santa Barbara County, a red-flag warning is in effect for the mountains and South Coast from 6 p.m. Saturday through 10 p.m. Monday because of the heat, low humidities and gusty "sundowner" winds, forecasters said.
The brunt of the heat is expected to hit the area Saturday into Monday. The high-pressure system will remain over the area through Monday but will weaken, allowing a bit more cooling in coastal areas starting Monday afternoon, Sweet said. But temperatures will remain above normal, and the valleys and inland areas will remain under an excessive heat warning through Monday, he said.
The triple-digit temperatures coincide with Labor Day weekend, which is typically one of the busiest beach days of the summer even absent a record-breaking heat wave.
As Southern California's coastal communities brace for an influx of visitors, public health officials are describing the weekend as a crucial test of whether Californians can slow the spread of the coronavirus by moderating their individual behaviors.
At 9:30 a.m Saturday, hundreds of beachgoers dotted the shore in Marina del Rey. Despite the morning hour, parking spots were hard to find, forcing families to walk multiple blocks, all while carrying plastic buckets, beach towels and umbrellas, to reach the beach.