SLO County weather forecast for the week of June 20

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

Weather Report

The summer solstice will arrive Monday at 3:34 p.m., when the Earth’s orbit brings the North Pole to its greatest exposure to the sun. At this period, if you happen to be north of the Arctic Circle, the sun never sets but remains above the horizon.

At our latitude in San Luis Obispo County, the sun will rise at 5:49 a.m. and set at 8:21 p.m. That gives us about 14 hours and 21 minutes of daylight. It is the longest day of the year and the first day of summer. This year’s summer solstice coincides with a full moon, also called a strawberry moon, which hasn’t happened in 70 years.

This summer will begin with well-above normal temperatures as high pressure in the upper levels of the atmosphere continues to build over California from the desert Southwest. This condition will produce mostly clear skies throughout the Central Coast as the Santa Lucia winds strengthen during the morning hours.

Temperatures will rise into Tuesday, especially away from the shoreline, as strong to gale-force afternoon northwesterly (onshore) winds will keep the beaches from warming up too much. Paso Robles could reach 104 degrees Monday and 106 by Tuesday. Closer to the coastline, San Luis Obispo will hit 90, while the beaches will remain in the 70s, except for the southwesterly facing beaches of Cayucos, Avila Beach and Shell Beach, which should reach the low 80s.

High pressure will begin to weaken Wednesday as an upper-level trough will develop over the Pacific, which will allow the marine layer to develop during the night and morning hours and thus bring lower temperatures.

Despite the anticipated cooling, triple-digit heat is expected across the far interior through next weekend. Overall, the temperatures are expected to remain above-normal across the inland valleys and slightly above-normal near the coast through next week. A warm start to summer indeed.

Surf Report

Monday’s 4- to 6-foot northwesterly (300-degree, deep-water) sea and swell (with a 5- to 9-second period) will increase to 5 to 7 feet with the same period Tuesday and will remain at this height and period through Wednesday. This northwesterly (310-degree, deep-water) sea and swell will further build to 7 to 9 feet (with a 5- to 8-second period) on Thursday into Saturday.

Arriving from the Southern Hemisphere: A 1-foot Southern Hemisphere (195-degree, deep-water) swell (with a 19- to 21-second period) will arrive Tuesday, increasing to 2 to 3 feet (with an 18- to 20-second period) Wednesday. This swell will further build to 2 to 4 feet (with a 17- to 21-second period) Thursday into Friday.

Seawater temperatures

Temperatures are projected to range between 51 and 54 degrees through Friday.

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This Week’s PG&E Safety Tip: Stay cool. When temperatures are unusually high, avoid strenuous activities in hot, direct sunlight and drink plenty of water. Muscle cramps, dizziness and nausea may be signs of a heat-related illness.

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

This week’s temperatures









57 104

60 106

61 103

58 100

59 99

57 97

58 98









61 90

60 91

60 85

59 84

57 83

58 81

59 83