A ridge of high pressure delivered copious amounts of sunshine and above-average warmth on Monday to the California Central Coast and South Coast, but it won't last much longer. A trough of low pressure will start pushing toward California, and it will bring more onshore flow. Lows tonight will range from near 40 inland to the 50s along our milder coasts.
The incoming trough of low pressure will push over California on Tuesday, bringing a rapid cooling of our air, more clouds, more wind, and a slight chance for rain showers, mainly along the South Coast. We'll have fewer clouds late Wednesday and Thursday. A second trough will miss our area just to the west Friday, followed by another trough on Sunday and Monday.
Overnight lows will begin warmer than average, then cool rapidly through the rest of the forecast. Valleys: lower 40s cooling to the 30s. Coasts: lower 50s cooling to the 40s. Daytime highs won't be nearly as warm as they have been, below average for most areas. Valleys: 60s and 70s, with Tuesday and Saturday being warmest. Coasts: upper 50s to the mid 60s.