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Autumn Heat Wave Expected To Continue Through Mid-Week

A hot October sun shines through palm trees in the San Carlos neighborhood of...

Photo by KPBS Staff

Above: A hot October sun shines through palm trees in the San Carlos neighborhood of San Diego, Oct. 3, 2020.

Warm temperatures were predicted for Sunday throughout San Diego County, the National Weather Service (NWS) said.

More warm temperatures can be expected Monday as the high-pressure system struggles to move across the desert of Arizona, forecasters said.

High temperatures near the coast Sunday will be 80-85 degrees with overnight lows of 53-63, according to the NWS. Inland valley highs will be 94- 99 with overnight lows of 50-60.

Mountain highs will be 87-94 with overnight lows of 52-62 and desert highs will be 103-108 with overnight lows of 69-78.

The high-pressure system will remain in control through Monday, the NWS said, with hot and dry conditions inland and a moderating afternoon sea breeze over coastal areas.

On Tuesday, a weak area of mid-level low pressure will start to make its way northeast into Southern California, forecasters said.

"This will create stronger onshore flow, providing some relief from the heat we have been seeing as of late," the NWS said. "Coastal valleys will cool progressively Tuesday into Wednesday seeing highs in the 80s, with highs near 90 degrees for parts of the Inland Empire and High Desert."

The lower deserts will still remain quite hot with highs above 100 degrees for this period. By the end of next week, a notable trough currently over the Aleutian Islands of Southwest Alaska will continue its trek toward the West Coast, the NWS said.

"This will bring even greater cooling and onshore flow by Thursday into next weekend," forecasters said. "This will bring greater coverage in night and morning low clouds, along with temperatures that are closer to average for this time of year."

Elevated fire weather conditions will persist inland through at least Monday due to extremely dry conditions, low humidity, and hot days.

"Winds will be mostly light, except during the onset of the sea breeze in the afternoons," the NWS said. "Westerly winds of 10-15 mph and locally 20-25 mph will work inland for a few hours, with some gusts around 30 mph near wind-prone slope and pass areas."

Along the coast, a shallow marine layer will moderate temperatures and humidity. The marine layer will remain shallow through Monday, and then slowly build inland through the week, easing the fire weather conditions slightly.

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