Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
A broad trough of low pressure off the coast will continue to produce mild summer weather through Tuesday across San Luis Obispo County as temperatures remain below-normal for this time of year.
Widespread low clouds, fog and areas of drizzle will develop during the night and morning hours, becoming clear during the afternoon hours.
The only exception will be the northwesterly facing beaches (Morro Bay, Los Osos, Montaña De Oro and the Nipomo Mesa), where only partial afternoon clearing will develop.
Maximum temperatures will reach the mid-80s in North County and mid-70s in the coastal valleys.
The beaches will range from the high 50s along the northwesterly facing beaches, to the low 60s along the westerly facing beaches (Pismo Beach, Grover Beach and Cambria), to the high 60s along the southwesterly facing beaches (Cayucos, Avila Beach and Shell Beach).
Tuesday will see a slow-moving area of low pressure drifting through the state, increasing the chance for afternoon thunderstorm development across the Sierra Nevada. At this time, it appears thunderstorm activity will remain over elevated terrain, but this may include the risk of new lightning-caused fire starts in the mountains.
The coastal northwesterly (onshore) winds will increase to fresh to strong (19- to 31-mph) levels starting Wednesday and will continue through Sunday, which will produce a much greater amount of afternoon clearing along the northwesterly facing beaches.
Temperatures will remain below normal for early August before gradually warming through the weekend into the following week. No extreme heat is anticipated through the forecast period.
Today’s 2- to 3-foot northwesterly (300-degree deep-water) swell (with a 7- to 9-second period) will remain at this height and period through Tuesday.
Fresh to strong (19- to 31-mph) northwesterly winds will generate 2- to 3-foot northwesterly (325-degree shallow-water) seas (with a 3- to 5-second period) Wednesday through Friday morning.
A 4- to 6-foot northwesterly (310-degree deep-water) sea and swell (with a 7- to 11-second period) will develop along our coastline Friday afternoon and will remain at this height and period through Sunday.
From the Southern Hemisphere: Today’s 1- to 2-foot Southern Hemisphere (215-degree deep-water) swell (with a 15- to 17-second period) will gradually diminish Tuesday.
Seawater temperatures will range between 53 and 57 degrees through Wednesday, decreasing to 52 and 55 degrees Thursday, and will remain at this level through Sunday.