San Diegans can expect a mid-week warm-up, with temperatures soaring to the mid-80s in some inland areas, before a gradual cooldown approaches. The heat spike is characterized by highs peaking around 20 degrees above average for parts of the inland valleys, accompanied by locally gusty Santa Ana winds near the coastal slopes of the mountains, according to the NWS San Diego.
However, a reprieve is in sight as the high-pressure system begins to weaken, yielding to cooling coastal temperatures and a shallow marine layer on Thursday and Friday. The cooling trend will expand inland over the weekend, bringing with it night and morning coastal low clouds that could spread into the western valleys as the marine layer deepens. This forecast was detailed in the Area Forecast Discussion by the National Weather Service San Diego CA.
The shift from sweltering to milder conditions continues, with Friday's anticipated high temperatures ranging from the mid- to upper 60s near the coast to the lower 80s in the valleys, and the lower to mid-80s in the lower deserts. Motorists should also be alert for potential hazards associated with patchy low clouds and locally dense fog, especially near the coast, Thursday night into Friday morning, which could persist into Saturday morning.
Looking further into the weekend and next week, while cooling will progress inland, temperatures will remain above average, with highs in the mid-to-upper 60s on the coast, and the interior valleys will experience mid-to-upper 70s. The lower deserts can expect it to be around 80 degrees, indicative of lingering warmth even in the face of a modest temperature reprieve. NWS San Diego suggests that such elevated temperature patterns are expected to persist, with high temperatures for inland areas still hovering 10 to 15 degrees above the norm.
Marine conditions are expected to remain mostly hazard-free through Sunday, aside from some intermittent fog that could impact visibility early Thursday through Friday morning. Additionally, there are no active watches, warnings, or advisories in place for the region, ensuring a period of moderate weather following the week's initial heat spike.
