Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
This morning’s marine low clouds and fog should burn off later this morning. Today’s high temperatures are forecast to hit the low 90s in the North County and high 70s in the coastal valleys. The beaches should remain in the 60s, except the southwesterly facing beaches of Cayucos, Avila Beach and Shell Beach, which is forecast to reach the 70s.
Little change in this weather pattern is expected Tuesday into most of Wednesday. However, changes are afoot later this week. Off the coast of Oregon, an early-season 976-millibar storm with 60-mph winds is forecast to develop Tuesday. The associated cold front should produce rain in Northern California from Monterey Bay northward Wednesday. This cold front should pass through San Luis Obispo County on Wednesday night into Thursday morning with a deep marine layer and pockets of mist and drizzle. The main effect for our area would be strong to gale-force (25- to 38-mph) post-frontal northwesterly winds along the coast and cooler conditions throughout the Central Coast on Thursday into Saturday. In fact, the northwesterly winds may reach moderate gale-force to fresh gale-force (32 to 46 mph) levels along the coast by Friday afternoon. Rain showers may linger over the Sierra this weekend. A warming trend should start Sunday and continue through next week.
Arriving from the Northwest: Today’s 3- to 5-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 11-second period) should remain at this height and period through Wednesday afternoon.
A 976-millibar storm with 60-mph west-northwesterly winds is forecast to develop west of Oregon on Tuesday. If the storm develops as advertised, a 5- to 7-foot northwesterly (300-degree, deep-water) swell (with a 15- to 17-second period) will arrive along the Central Coast on Wednesday evening, peaking Thursday morning at 7 to 9 feet (with a 14- to 16-second period). A 6- to 8-foot northwesterly sea and swell (with a 5- to 12-second period) is forecast along our coastline Thursday afternoon through Sunday.
Arriving from the South: An intense storm is forecast to develop southeast of New Zealand on Tuesday. If the storm develops as advertised, a long-period Southern Hemisphere swell will arrive along our coastline by the end of September.
Intake seawater temperatures are forecast to range from 59 and 65 degrees through Wednesday, decreasing Thursday through Saturday.