As Southern California endures a period of hazardous heat, the National Weather Service (NWS) San Diego has issued Excessive Heat Warnings adequate through 8 PM today for the regions including the Coachella Valley, San Diego Deserts, Inland Empire, San Diego Valleys and Foothills, and the Santa Ana Mountains. Heat Advisories have been announced alongside these warnings for the mountainous areas in San Diego, Riverside, and San Bernardino counties.
Despite a slight temperature decrease, the current climate remains 15 to 20 degrees above average for portions of the mountains, deserts, and inland valleys, according to the National Weather Service San Diego. Today's highs are predicted from the lower to mid-70s near the coast to upwards of 104 degrees for the inland valleys; meanwhile, the lower deserts remain scalding, with temperatures reaching 108 to 114 degrees, making yesterday's weather seem marginally cooler although comparably blistering.
A slight shift toward cooler temperatures is forecasted for Tuesday, with a reduction of a few degrees to around 5 degrees. NWS San Diego describes 10 to 15 degrees above average for portions of the mountains, deserts, and inland valleys on this day. The coastal and valley regions face lower to mid-70s to the 90s, with mountain elevations from 4500 to 7000 feet experiencing the 70s and 80s.
The marine layer's persistent shallow presence along the coast will slightly deepen as the week progresses, however coastal low clouds and fog are not anticipated to stretch beyond the far western valleys notes NWS San Diego. Meanwhile, night and morning fog is a staple in the daily forecasts, anticipated before 11 am and arriving again in post-sunset hours. With these misty conditions swiftly developing into clearer skies, the inland valleys and mountains brace for higher temperatures that will be 5 to 10 degrees above average heading into the next weekend as the weather slowly tempers down.
As residents grapple with the adverse effects of the heat, mariners are warned of visibility concerns due to fog, with visibility dropping to 1 nm or less at times. For San Diego's coastal dwellers and visitors, mornings will be shrouded in areas of fog until around 11 a.m. Then, skies are predicted to clear gradually, yielding to sunny conditions, as presented by the detailed 7-day forecast for San Diego.
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