Early on Thursday, we'll start out the day with areas of low clouds and fog, especially north of Point Conception. A low pressure system will shift southeastward into San Diego County by Thursday afternoon, allowing for some moisture to move across the mountains and interior valleys. These spots have a chance of seeing a few showers or storms during the afternoon and early evening, with dry but muggy conditions expected elsewhere.
The coastal marine layer will continue from Friday right on through the weekend as another low pressure system drops down the west coast. This will keep high pressure over the 4 Corners and the Pacific Ocean. Temperatures will therefore change very little through the weekend...with highs in the 70s and 80s by the coast, and the 80s to lower 90s in the valleys. Early next week, our forecast should warm slightly as the trough lifts and high pressure expands into our area.