Autumn appears to have arrived in SLO County after a weekend of summer-like temperatures

High temperatures Sunday in the North County soared past 100 degrees, but today the highs will only be in the 80s, thanks to a Gulf of Alaska storm system’s effect on our weather.

Paso Robles had a high Sunday of 102 – and Shandon was the hot spot with a 107 reading. But highs in Paso today will reach just the mid-to-high 80s, said John Lindsey, local meteorologist with Pacific Gas and Electric Co. San Luis Obispo will see highs just in the low 70s.

The deep layer of fog that normally blankets the coast pushed well inland this morning, with visibilities early today of only a quarter-mile at the Paso Robles Airport.

The fog should burn off in the North County and San Luis Obispo by early afternoon, but will return tonight.

As the storm system works its way down the California coast on Tuesday, conditions will get even cooler.

Lindsey said morning drizzle will give way to a cloudy, windy day, with highs in the low 70s in San Luis Obispo and the high 70s in the North County. The winds will be strong, blowing between 25 to 38 mph by afternoon.

As the low-pressure area moves past San Luis Obispo County Tuesday night, the overnight lows in the North County will fall into the high 30s, Lindsey said.

Wednesday will warm slightly and be sunny, but continue breezy. Thursday will mark the start of a two-day warm up, as the winds turn and blow offshore, pushing the fog layer out to sea.

But another low-pressure system drops south toward California over the coming weekend, bringing a return of morning fog and cooler daytime temperatures. Lindsey said there is a chance of rain as far south as Monterey, and the Sierra’s high peaks will get a new dusting of snow.

--Tad Weber