San Diego residents should brace themselves for another day of sweltering heat, as forecasters at the National Weather Service San Diego anticipate temperatures in the region to hover around the 90-degree mark. According to NWS San Diego, the mercury could even soar close to 100F in some areas if the sea breeze weakens during the afternoon on Tuesday.
Inland areas, deserts, and mountains are set to battle not just the heat but also low humidity levels. With very dry conditions expected Tuesday afternoon, locals in these regions should take extra care to stay hydrated and take measures to prevent heat-related illnesses. The Area Forecast Discussion by the NWS expanded on this, noting that this heatwave is courtesy of "high pressure to the south" and is slated to maintain its grip through Wednesday, driving temperatures up to "10 to 15 degrees above average for the deserts."
Cooling is on the horizon, however, with forecasters predicting a downward temperature trend starting Thursday and continuing into the weekend. The marine layer is expected to deepen, bringing "night and morning coastal low clouds and fog" further into the valleys for a more pronounced cooling effect come Sunday. This will offer a reprieve from the intense heat, with temperatures potentially dipping as much as "10 to 15 degrees below average for the mountains and inland valleys," according to the National Weather Service San Diego.
Despite the current heat advisory in place until 8 PM PDT Wednesday, especially targeting regions like the Riverside County Mountains and the San Bernardino and Riverside County Valleys, residents can look forward to more comfortable conditions soon. The marine layer, thickening to "1500 to 2000 feet," will facilitate night and morning clouds that will bring down Sunday's high temperatures to around 70 near the coast, and up to an "upper 80s for the Inland Empire with around 100 for the lower deserts." While the marine environment remains stable with no hazardous conditions expected through Saturday, those on land should remember that heat precautions remain crucial until the weekend's cooling relief takes full effect, according to the National Weather Service.
