In a forecast update for San Diego, the National Weather Service reports a warm and dry pattern through Thursday, followed by an expected cooldown over the weekend. According to NWS San Diego, Wednesday's temperature hike will be most felt inland, with a 5 to 10-degree increase, and an additional slight rise by Thursday. Coastal regions, on the other hand, are looking at mild temps ranging from 66 to 70 degrees today, and a similar slightly cooler profile tomorrow.
The weekend ushers in noticeable change, as mentioned in the Area Forecast Discussion by NWS San Diego. A northwest low-pressure system moves in, dropping temperatures significantly, by as much as 12 to 18 degrees below average in mountain and inland valley regions. Saturday night could sprinkle some showers, primarily in San Diego County, stretching from the coast to the mountains, while gusty west winds will prevail in the mountains and deserts.
Marine conditions are set to remain stable through Saturday, with no hazardous events forecasted. However, late Saturday and Sunday, we could see a change, with stronger winds and higher seas anticipated. The marine forecast suggests west-northwest winds gusting near 20 knots near San Clemente Island until this evening.
The NWS advisory also notes that a marine layer, which has been quite deep at around 3500 to 4000 feet, will become "a little shallower for Thursday into Friday." This could mean night and morning coastal low clouds creeping into parts of the valleys, but mostly not onto the coastal mountain slopes. As for aviation, conditions are expected to be mostly clear today and tonight, with westerly winds decreasing throughout the morning. Localized low-level wind shear or rotor effects may be encountered, particularly in areas near the mountains.
