The National Weather Service in San Diego reports a change in the weather pattern for the greater San Diego area, with conditions fluctuating below and above normal temperatures across various regions today. Coastal areas and valleys will experience cooler weather with temperatures approximately 5 degrees below the norm, while desert areas might find a slight rise in temperatures above the usual. According to the National Weather Service, the marine layer remains dense enough to see clouds spilling into the inland valleys and foothills early this morning.
A high-pressure system and offshore flow are expected to bring about warmer and drier conditions as the marine layer becomes shallower, extending into next weekend. This change will bring high temperatures closer to seasonal averages in coastal locations or slightly below, while inland areas could see temperature spikes up to 7 degrees above average, as noted by the NWS San Diego. However, with a low-pressure trough moving inland to the north, cooler temperatures and variable clouds accompany stronger onshore flow, gusts reaching 25-35 mph being reported in certain locations, the offshore flow likely peaking Tuesday afternoon through Wednesday morning with significantly lower humidity levels, especially in inland valleys where relative humidity might drop as low as 12%.
Midweek predictions indicate a considerable rise in temperatures, "about 5-15 degrees above normal," especially for inland valley communities. As for wind conditions, gusty offshore winds are slated for Tuesday into Wednesday, with northeast winds expected to achieve 45-55 mph in certain mountain passes and areas like Cajon Pass and the Santa Ana Mountains; gusts of 35-45 mph are also anticipated in the mountains and foothills of San Diego County, as per the NWS San Diego.
The latter part of the week may bring a slight drop in temperatures as the high-pressure ridge yields to a weaker trough moving inland to the north that introduces a refreshed marine layer and mild onshore flow, marking a subtle shift in conditions. For those navigating the skies, VFR (Visual Flight Rules) conditions are anticipated throughout the region, save for occasional wind gusts of 25-35 kts expected along eastern mountain slopes on Sunday afternoon and evening, meanwhile, mariners are advised of northwest winds reaching up to 18 knots this afternoon and evening, primarily around the outer waters near San Clemente Island but, no hazardous marine conditions are forecasted through Thursday.
