SLO County weather forecast: Inland areas to reach triple-digit temperatures this week

A late-season, low-pressure system and associated cold front will move southward down the California coastline on Sunday. This system will produce fresh to strong (19 to 31 mph) northwesterly winds during the afternoon, decreasing during the night and morning, a deeper and more persistent marine layer with areas of dense fog and drizzle during the night and morning. Finally, a cut-off low pressure system off the coast of the Pacific Northwest will produce southwesterly flow aloft which will bring mid to high-level clouds throughout the Central Coast.

Sunday’s high temperatures will range from the low-80s in the North County (Paso Robles) and low-70s in the coastal valleys (Paso Robles). The beaches will range between the high-50s to low-60s.

This storm will spread rain as far south as the Bay Area to Yosemite line Sunday morning. Showers will continue through Sunday afternoon but will likely be limited to elevated terrain by Sunday evening. An isolated thunderstorm cannot be ruled out across the northern Sacramento Valley Sunday afternoon.

In the cold front’s wake, moderate gale-force to fresh gale-gale force (32 to 46 mph) northwesterly winds and mostly clear skies will develop along the coastline on Monday and will continue through Thursday.

High pressure will build over Central California on Thursday into next weekend, producing warmer temperatures with the inland valleys (Paso Robles) reaching triple-digit levels as early as Thursday and will continue to reach into the 100-degree territory through Sunday, if not longer. The coastal valleys (San Luis Obispo) will reach into the mid-80s. The northwesterly winds will decrease next weekend; consequently, the beaches will remain in the 60s under mostly overcast skies (June Gloom).

Surf report

Sunday’s 4- to 6-foot northwesterly (310-degree, deep-water) sea and swell (with a 7- to 11-second period) will remain at this level through Monday morning.

Increasing northwesterly winds will generate a 7- to 9-foot northwesterly (310-degree, deep-water) sea and swell (with a 7- to 11-second period) on Monday afternoon into Thursday, decreasing on Friday into next weekend.

Arriving from the Southern Hemisphere: Sunday’s 2- to 3-foot (220-degree, deep-water) swell (with a 15- to 17-second period) will remain at this level, but with a gradually shorter period through Monday.

Seawater temperatures will range between to 50 to 54 degrees through Sunday, decreasing to 49 to 52 degrees on Monday into Friday.

This week’s temperatures

LOWS AND HIGHS, PASO ROBLES

LOWS AND HIGHS, SAN LUIS OBISPO AND COASTAL VALLEYS

PG&E safety tip

Drizzle during the night and morning this weekend after a dry period could releases oil, grease and rubber dust that has accumulated on roadways, creating slippery conditions. Driving too fast is the No. 1 cause of traffic accidents on wet days.

Tragically over the years, first responders, such as California Highway Patrol officers, firefighters, Caltrans highway workers and Pacific Gas and Electric Co. line crews have been hit by vehicles. So please, “Slow for the Cone Zone.” One of the most significant hazards for workers along highways is motorists who do not exercise caution while driving through work zones.

John Lindsey’s is PG&E’s Diablo Canyon marine meteorologist and a media relations representative. Email him at pgeweather@pge.com or follow him on Twitter @PGE_John.

This story was originally published June 5, 2022 at 5:00 AM.