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SLO County weather forecast for the week of Sept. 11

John Lindsey
John Lindsey dmiddlecamp@thetribunenews.com

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

An upper-level low-pressure system will meander about 100 miles to the west of San Luis Obispo and will bring monsoon moisture from the south across the Central Coast. Expect scattered rain showers and a chance thunderstorms to develop into Monday afternoon, with between a tenth and a half of an inch of rain. Thunderstorms are expected over the elevated terrain of eastern San Luis Obispo and Santa Barbara counties. Note: Thunderstorms can produce gusty winds, heavy downpours and lightning. The system will also produce gentle to moderate (8 to 18 mph) southwesterly winds along the coastline Monday into Wednesday.

Monday’s air temperatures will reach the mid-90s in the North County and mid-80s in the coastal valleys. The beaches will warm to the 70s. High relative-humidity levels will make it feel much warmer and muggy.

Lingering monsoon moisture will lead to additional chance of thunderstorms Tuesday and Wednesday over the mountains, with partly cloudy skies and muggy conditions elsewhere along the Central Coast.

The upper-level low will finally track inland Thursday, which will sweep the monsoon moisture east of California and will usher in strong to gale-force (25 to 31 mph) northwesterly (onshore) winds along the coastline, night and morning marine low clouds with fog and mist, seasonal temperatures and mostly clear late-morning and afternoon skies through the weekend.

Surf report

A 3- to 5-foot northwesterly (295-degree, deep-water) swell (with an 8- to 13-second period) is forecast along our coastline Monday into Wednesday.

A 5- to 7-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 10-second period) is forecast along our coastline Thursday into Friday, decreasing to 3 to 5 feet Saturday.

Seawater temperatures will range between 56 and 60 degrees through Wednesday. Seawater temperatures will decrease Thursday into Saturday.

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At PG&E, the safety of our customers and employees is our top priority. Each year in the United States, more than 400 people are struck by lightning. There is no safe place outside in a thunderstorm. Remember, “when thunder roars, go indoors!”

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

62 94

61 88

58 87

56 85

52 85

53 90

54 94

LOWS AND HIGHS, SLO AND COASTAL VALLEYS

MON

TUE

WED

THU

FRI

SAT

SUN

61 87

62 82

60 77

60 75

57 76

56 80

57 83

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