San Diegans can generally expect typical seasonal weather to persist into next week, with inland regions bracing for hot, dry conditions and coastal areas benefiting from the cooling effects of the marine layer. The National Weather Service San Diego has outlined that the pattern of night and morning coastal low clouds will continue to roll into parts of the valleys, retreating to near the coastline each afternoon.
The forecast is set to shift slightly across the region, as Thursday is predicted to cool down, followed by a rise in temperatures on Friday and Saturday—Saturday is projected to be the week's peak. The forecast, obtained by the National Weather Service San Diego, notes that "high temperatures today for the coast and valleys will be several degrees warmer than Tuesday" due to a thinning marine layer. However, they warn, a "weak low pressure system moves inland through southern California late Thursday," ushering in a drop in temperature.
By Friday, conditions inland are forecasted to warm substantially, with the mountains and valleys like the Apple and Lucerne Valleys experiencing temperature climbs between 4 to 8 degrees—a trend set to push them around 10 degrees above the seasonal average for deserts and 5 degrees for inland valleys. The local aviation and marine conditions look favorable for the most part, with no hazardous situations anticipated at sea through Saturday and clear skies prevailing over mountains and deserts.
The approaching weekend will bring a more marked temperature rise, with the lower deserts potentially hitting a scorching 114 degrees, potentially triggering an Excessive Heat Warning for Saturday. According to the discussion section of the National Weather Service San Diego forecast, "The heat risk from the current forecast would be sufficient for an Excessive Heat Warning for the lower deserts on Saturday, but not quite sufficient on Friday." A subsequent change in the weather is anticipated as a low-pressure system moving through the western states is expected to strengthen onshore flows, leading to cooler weather Sunday through Tuesday. It's projected to be a welcomed drop, with the National Weather Service San Diego indicating that temperatures will cool down "around 4 to 8 degrees cooler than Saturday," especially felt at the inland valleys and lower elevations.
For travel near the coast, low clouds stretching up to 20 miles inland as of this morning, and causing visibility issues in some areas, may affect morning and late afternoon travel. The National Weather Service San Diego advises that "night and morning coastal low clouds will spread into portions of the valleys, then clear to near the coast each afternoon." Meanwhile, Skywarn activation is not presently required, but weather spotters are continually urged to report significant weather phenomena.
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