SLO County weather forecast for the week of Sept. 9

pgeweather@pge.comSeptember 8, 2013 

Here is this week’s weather forecast from PG&E meteorologist John Lindsey:

A 1,024-millibar Eastern Pacific High about 900 miles northwest of San Luis Obispo combined with a thermal low over the Central Valley will continue to produce persistent onshore flow.

This condition will produce an entrenched marine layer with night and morning fog and drizzle and overcast skies along the beaches throughout most of the day.

However, partial afternoon clearing is expected along the southwesterly facing (Avila Beach, Cayucos and Shell Beach) beaches.

Maximum temperatures along the beaches will range from the high 50s to the mid-60s. Little change in this pattern is expected through Wednesday.

The coastal valleys will see night and morning low clouds and fog clearing by the afternoon hours, with maximum temperatures reaching the upper 70s. The North County will remain warm and clear with temperatures reaching the high 90s. Maximum temperatures in the North County will drop to the low 90s Tuesday and Wednesday, with the possibility of morning low clouds and fog.

An area of low pressure will move through Northern California on Thursday, which will produce a steep pressure gradient along the Central Coast. This pressure gradient will produce strong to gale-force (25- to 38-mph) afternoon coastal northwesterly winds starting Thursday and continuing through Sunday. These winds will mix out the temperature inversion layer and will give clear and sunny skies along the beaches.

Overall, temperatures in San Luis Obispo County will remain near seasonal norms through next week.  The long-range models are still not indicating any rain for the Central Coast.

Today’s surf report

Today’s 2- to 3-foot northwesterly (300-degree deep-water) swell (with an 8- to 11-second period) will remain at this height and period through early Wednesday.

A 2- to 3-foot northwesterly (290-degree deep-water) swell from the Gulf of Alaska (with a 16- to 18-second period) will arrive along our coastline Wednesday afternoon, increasing to 4 to 5 feet (with a 13- to 15-second period) by Thursday morning.

Strong to gale-force (25- to 38-mph) northwesterly winds will generate a 4- to 6-foot northwesterly (310-degree deep-water) sea and swell (with a 5- to 12-second period) Thursday afternoon and will remain at this height and period through Saturday.

A 1-foot Southern Hemisphere (200-degree deep-water) swell (with a 16- to 18-second period) will arrive along the Pecho Coast on Wednesday, building to 1 to 2 feet (with a 14- to 16-second period) Thursday.

Seawater temperatures

Seawater temperatures will be between 57 and 61 degrees through Thursday, decreasing to 55 and 58 degrees Friday, and will remain there through Saturday.

John Lindsey’s Weekly Forecast is special to The Tribune. His Weather Watch column appears in the Local section Sundays. Email him at

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