A sign at the Anaz Borrego State Park near Borrego Springs. Courtesy University of California

A summer heat wave kept the San Diego area sweltering again Friday, setting a few temperature records while sending residents on quests for shade, cool rooms, swimming pools and breezy beaches.

For a second consecutive day, the spate of extra-hot conditions sent the mercury to triple-digit heights in various East County communities, according to meteorologists.

A National Weather Service excessive-heat warning for the deserts is slated to be in effect until 9 p.m. Saturday, with a less severe heat advisory for the mountains and valleys running concurrently.

Friday afternoon brought maximum thermometer readings of 120 degrees in Borrego Springs, topping the prior record of 117 for the date; 108 in Campo, exceeding the former milestone of 103; and 102 in Ramona, surpassing the old July 7 peak of 101. Each of the since-broken records had been set in 1976.

Other highs included 120 degrees in Ocotillo Wells; 104 in Valley Center; 100 in San Pasqual Valley; 99 in Alpine, Escondido and Poway; 98 in Julian; 95 in El Cajon; 94 in Fallbrook and Santee; 93 on Palomar Mountain; 91 in Rancho San Diego; 90 in Rancho Bernardo; 89 on Mount Laguna; 88 at Brown Field airport; 87 in Vista; 85 in Lemon Grove; and 79 at Lindbergh Field and in Solana Beach.

More pleasant temperatures prevailed in coastal locales, including Oceanside Harbor, where the hottest it got was 75 degrees, and Del Mar, which maxed out at 73.

The heat wave will peak Saturday, forecasters said. Until it subsides, it is advisable to reschedule strenuous activities to early morning or evening, drink plenty of water, wear lightweight and loose-fitting clothing and be aware of the signs and symptoms of heat exhaustion and heat stroke, according to the weather service.

Officials also repeated their standard warning against leaving children, seniors or pets in parked cars, which can heat up to lethal levels in just minutes, even with a window partially open.

Cooler conditions are expected to prevail early next week, but isolated afternoon thunderstorms that will increase the risk of dry lightning may possibly develop over the mountains, with the greatest potential Sunday, the NWS reported.

–City News Service

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