Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
As if on cue after the end of the Mid-State Fair, a trough of low pressure has developed along the coast and will result in much lower North County temperatures today and Tuesday.
If you thought the fair was warmer than average, you were right. The average maximum temperature at the fair is usually 94 degrees; this year it was 96 degrees. The average minimum temperature is 54 degrees; at this year’s fair it was 57 degrees.
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Today’s maximum temperatures will reach the low 80s in the North County, the low 70s in the coastal valleys and mid-60s along the beaches.
This low-pressure system will also produce a deep marine layer with areas of night and morning fog and drizzle along the beaches and typical valley locations. With the relaxation of the northwesterly winds, little afternoon clearing is expected along the beaches through Tuesday.
Temperatures begin to rebound Wednesday as San Luis Obispo County enters a weak warming trend, which is expected to last through the weekend with highs reaching seasonal averages near the coast and slightly above-normal across the North County. Increasing northwesterly winds along the coast will produce more sun along the beaches starting Wednesday and continuing through the rest of the week.
The wind fields have shifted northward off Cape Mendocino. These winds will generate a 4- to 6-foot northwesterly (310-degree deep-water) swell with an 8- to 10-second period along our coast today, decreasing to 3 to 5 feet with a 7- to 9-second period Tuesday.
Strong to gale force (25- to 38-mph) northwesterly winds along the Central Coast will generate a 4- to 6-foot northwesterly (325-degree deep-water) sea and swell with a 4- to 9-second period Wednesday, increasing to 5 to 7 feet with a 5- to 8-second period Thursday through Friday.
A 3- to 5-foot (320-degree deep-water) northwesterly swell with a 7- to 9-second period will develop next weekend.
Arriving from the Southern Hemisphere: Today’s 1- to 2-foot Southern Hemisphere (195-degree deep-water) swell with a 14- to 18-second period will build to 1 to 3 feet with a 13- to 19-second period Tuesday through Wednesday.
A 1- to 2-foot Southern Hemisphere (215-degree deep-water) swell with an 18- to 20-second period will arrive Friday, building to 1 to 3 feet (with a 16- to 18-second period) next weekend.
Seawater temperatures will range between 55 and 58 degrees through Wednesday, decreasing to 52 and 54 degrees Thursday and will remain at this level through Sunday.