Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
The ridge of high pressure that brought Santa Lucia (offshore) winds and hot temperatures along the beaches and coastal valleys over the past few days has weakened. This morning’s marine low clouds with pockets of mist and drizzle in the coastal regions is forecast to expand tonight into Tuesday. Today’s maximum temperatures along the beaches and coastal valleys of San Luis Obispo should be 10 and 15 degrees cooler than Sunday’s, while the North County should remain just about the same.
The northwesterly (onshore) winds are expected to strengthen along the coast Tuesday afternoon, further increasing the strong to gale force (25 to 38 mph) levels Wednesday into Thursday in response to a weak area of low pressure moving through Northern California.
This condition should produce cooler temperatures throughout the Central Coast, including the North County on Tuesday through Thursday. In fact, all San Luis Obispo County locations are forecast to be back to near normal with night and morning marine low clouds by Wednesday.
A high pressure ridge is forecast to build over California starting Friday and will continue through next weekend for another round of Santa Lucia (offshore) winds and high temperatures. The ridge is not expected to be as strong this time and temperatures are forecast to reach into the 80s to low 90s through the weekend. Cooler weather returns about midweek.
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Arriving from the Northwest: Today’s 3- to 5-foot northwesterly (300-degree, deep-water) swell (with a 7- to 11-second period) will continue at this height and period through Wednesday morning.
A 3- to 5-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 11-second period) will develop along our coastline Wednesday afternoon and will remain at this height and period through Thursday.
A large Gulf of Alaska storm (960 millibar) is expected to develop later this week. If the storm develops as advertised, a 3- to 5-foot northwesterly (300-degree, deep-water) swell (with an 18- to 20-second period) will arrive Friday, building to 6 to 8 feet (with a 16- to 18-second period) this weekend.
Arriving from the South: Today’s 1- to 2-foot Southern Hemisphere (200-degree, deep-water) swell (with a 14- to 16-second period) will gradually decrease over the next 48 hours.
Seawater temperatures are forecast to range from 60 and 65 degrees through Wednesday, decreasing Thursday through Saturday.