Thunderstorms started to develop over the San Diego mountains Saturday afternoon. Photo Credit: National Weather Service

A summer heat wave that peaked Friday continued with roughly the same heat or less Saturday when several cities across the county experienced record-high temperatures.

The southerly surge of humid air at the coast and in the desert was the main force that helped halt the rising mercury, meteorologists said. But thermometers across the county still saw several areas hitting triple digits, including in Ocotillo Wells, where the temperature was 110 degrees and rising at 4:30 p.m. Borrego Springs also hit its high for the day later than expected, topping out at 112 degrees at 4:30 p.m.

Despite the temperatures not reaching as high as expected, an excessive heat warning for the deserts was still in effect until 9 p.m. Saturday, with a less severe heat advisory for the mountains and valleys running concurrently.

The humid air meant some areas saw their hottest temperatures in the morning before the surge helped halt the expected hot weather.

Thunderstorms developed over the Santa Ana mountain reaching up to 45,000 feet, with some moving into the San Juan Capistrano area, according to the National Weather Service. Some lightning strikes in Warner Springs sparked multiple brush fires Saturday.

Scattered thunderstorms and rain also helped bring temperatures down in some areas like Warner Springs, where Cal Fire reported rain and several lighting strikes.

The afternoon saw highs of 103 degrees in Alpine and Campo, 101 in Ramona and Valley Center, 97 in Fallbrook and Santee, 95 in Escondido and at Gillespie Field in El Cajon, 90 in La Mesa and 89 in Torrey Pines.

Cooler temperatures prevailed in the City of San Diego and along the coast, with highs of 80 in Carlsbad, 79 in Oceanside, 78 in Chula Vista and La Jolla, 77 in National City, 76 at Lindbergh Field and Imperial Beach and 74 in Solana Beach.

The cooling trend is expected to continue Sunday and into early next week.

City News Service contributed to this article.

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