Heatwave To Follow Cool Weekend Weather In San Diego County

SAN DIEGO COUNTY, CA — A deep marine layer and onshore flow will keep the weather on the cool side again Saturday, but high pressure building aloft will bring a sharp warm-up next week, forecasters said.

Low clouds will be less extensive Saturday night, and be confined to coastal areas after Monday morning as the marine layer shrinks, the National Weather Service said.

Good morning, #SoCal! Highs today will be near to slightly below normal. Today will be the coolest day before the heat returns for the valleys and deserts next week! #cawx pic.twitter.com/LsDUE99jWX
— NWS San Diego (@NWSSanDiego) May 23, 2020

Coastal temperatures Saturday will be between 68-73 degrees and overnight lows will be 52-58 with mostly cloudy skies, the NWS said. Temperatures in the valleys will be 71-76 and overnight lows 49-54 with patchy fog.

Temperatures will be well above normal inland next week, the weather service said, while persistent onshore flow will keep a shallow marine layer near the coast. Clouds and fog may become more persistent over coastal areas later in the week as cooling begins to work inland.

Prolonged desert heat wave this week

Highs 10-20 degrees above normal away from coast

Here's a look at possible temperatures for cities in our area deserts.

Remember, you can check the forecast for your location at https://t.co/H57veCTtuD #CAwx pic.twitter.com/zSq8K5P0KK
— NWS San Diego (@NWSSanDiego) May 23, 2020

For the deserts, the heat is expected to peak Wednesday and Thursday when highs in the upper deserts will exceed 100 degrees and the lower deserts will be near or over 110, forecasters said.

Some cooling will occur Friday with greater cooling next Saturday as the upper ridge slowly weakens and shifts east.

—City News Service