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SLO County weather forecast for the week of Sept. 25

Kitesurfers take over Cayucos beach

Dozens of kitesurfers took advantage of clear, sunny weather and steady wind on the beach between Morro Bay and Cayucos on Sept. 20, 2017.
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Dozens of kitesurfers took advantage of clear, sunny weather and steady wind on the beach between Morro Bay and Cayucos on Sept. 20, 2017.

Here is this week’s weather forecast by PG&E meteorologist John Lindsey.

The first full day of fall occurred Saturday. As if on cue for the Central Coast, high pressure will begin to build back into California through this week. In other words, the final days of summer saw temperatures across the Central Coast run below-normal and even the first dusting of snow across higher the elevations of the Sierra Nevada, while the first official week of autumn will feature above-normal temperatures.

It’s not uncommon for October to be the warmest month of the year in the coastal valleys and along the beaches. In the first week of October 1987, a strong, high-pressure ridge combined with Santa Lucia (northeasterly) winds to produce a scorching heat wave across California. San Luis Obispo was the warmest location in the nation, with 111-degree temperatures recorded at the airport two days in a row.

This high-pressure ridge will produce gentle to moderate (8 to 18 mph) and at times gusty Santa Lucia (offshore) winds during the morning hours, shifting out of the northwest during the afternoon, and warmer conditions. In fact, San Luis Obispo and Paso Robles will warm to the high 80s to low 90s by Tuesday.

For the remainder of the week, current longer-range models suggest dry and warm weather will continue into the end of September. Still no rain in sight, as high pressure will continue to meander over the Central Coast.

Surf report

Monday's 3- to 5-foot northwesterly (310-degree, deep-water) sea and swell (with a 7- to 11-second period) will continue at this level into Tuesday. A 2- to 4-foot northwesterly (300-degree, deep-water) swell (with an 8- to 11-second period) will develop along our coastline Wednesday into Friday morning.

Increasing northwesterly winds Friday afternoon into Sunday will generate a 3- to 4-foot northwesterly (310-degree, deep-water) sea and swell (with a 7- to 11-second period) on Friday afternoon into next Sunday.

Arriving from the Southern Hemisphere: A potentially significant Southern Hemisphere swell could arrive along our coastline Oct. 5.

Seawater temperatures will range between 53 and 57 degrees through Friday.

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At PG&E, the safety of our customers and employees is our top priority. Buckling up is such a simple thing to do; it only takes two seconds, and no other single action has as much lifesaving potential. If more adults wore safety belts, their kids would, too. Besides, it’s the law.

John Lindsey’s Weekly Forecast is special to The Tribune. He is PG&E’s Diablo Canyon Power Plant marine meteorologist and media relations representative. Contact him at pgeweather@pge.com. Follow him on Twitter @PGE_John.

This week’s temperatures

LOWS AND HIGHS, PASO ROBLES

MON

TUE

WED

THU

FRI

SAT

SUN

48 87

52 91

53 96

53 94

53 93

55 94

57 91

LOWS AND HIGHS, SLO AND COASTAL VALLEYS

MON

TUE

WED

THU

FRI

SAT

SUN

53 85

56 86

58 87

59 86

59 87

60 87

60 84

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