Heat wave headed to SLO County after a sunny, breezy Memorial Day weekend

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Heat wave headed to SLO County after a sunny, breezy Memorial Day weekend

Weather watches and warnings

A live data feed from the National Weather Service containing official weather warnings, watches, and advisory statements. Tap warning areas for more details. Sources: NOAA, National Weather Service, NOAA GeoPlatform and Esri.

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Steve Wilson *****@*****.tld

San Luis Obispo County can expect a mild, windy and sunny Memorial Day weekend, followed by “May Gray” weather during the week.

A pattern of strong to gale-force (25 to 38 mph) northwesterly winds developing during the afternoon and decreasing during the night and morning will continue through Memorial Day.

These winds will produce primarily clear skies, except for low marine clouds with pockets of fog and mist at night and in the morning.

Temperatures will remain mild. Inland valleys like Paso Robles will warm into the low 80s, while coastal valleys such as San Luis Obispo will reach the low 70s.

Most beaches will see highs in the 50s to low 60s, though southerly facing beaches like Cayucos, Avila Beach and Shell Beach could climb into the low 70s thanks to these downslope winds.

The northwesterly winds will decrease on Tuesday and Wednesday to moderate-to-fresh (13 to 24 mph) levels, further lowering to gentle-to-moderate (8 to 18 mph) levels on Thursday into the following weekend.

This condition and increasing inland valley temperatures will produce a deep marine layer with night and morning fog and mist, with some clearing along the shoreline in the afternoon, known as “May Gray.”

Away from the ocean, high pressure expanding from the desert will produce the first triple-digit temperatures of 2025 at the Paso Robles Municipal Airport on Friday and Saturday.

The record daily high at the airport is 102 degrees on Friday and 106 on Saturday, which could both be broken by this week’s temperatures — forecast to reach 102 on Friday and 107 on Saturday.

Closer to the ocean, San Luis Obispo is expected to reach the low to mid-80s, while all the beaches will range from the high 50s to the low 60s under cloudy skies.

Over this *******, the Central Valley could see temperatures ranging between 110 and 115 degrees.

Looking further ahead, long-range models indicate that dry conditions will continue through the end of June.

Surf report

Gale-force northwesterly winds along the California coastline will generate a 6- to 8-foot northwesterly (305-degree deep water) sea and swell (with a 5- to 9-second *******) on Saturday through Memorial Day.

A 5- to 7-foot northwesterly (295-degree deep water) sea and swell (with a 7- to 11- second *******) is forecast on Tuesday, decreasing to 3 to 5 feet (with an 8- to 11-second *******) on Wednesday and remaining at this level through next Saturday.

A 1- to 3-foot southern hemisphere (205-degree deep water) swell (with a 15- to 18- second *******) will arrive along our coastline on Saturday and remain at this level through Tuesday, gradually fading away on Wednesday.

On June 1 and 2, the highest southern hemisphere swell of the year is expected to arrive at our coastline, at 3- to 5-feet (with an 18- to 22-second *******) from 200 degrees.

Surface seawater temperatures will range between 49 and 51 degrees through Tuesday, gradually warming through next weekend.

On this date in weather history (May 25)

1917: A tornado ripped through southeast Kansas, traveling 65 mph and setting a record for the average speed of any tornado.

1989: Thunderstorms developing ahead of a strong cold front produced severe weather from Oklahoma to Ohio through the day and night. Thunderstorms spawned nine tornadoes, and there were 155 reports of large hail and damaging winds. Hail 3.5 inches in diameter was reported at Dittmer, Missouri, and thunderstorm winds gusting to 90 mph caused $20 million at Rockville, Indiana. (The National Weather Summary) (Storm Data)

2018: A late-season, low-pressure system centered over the Bay Area produced light rain showers throughout the Central Coast.

This week’s temperatures

LOWS AND HIGHS, PASO ROBLES

SUN

MON

TUE

WED

THU

FRI

SAT

SUN

47, 83

47, 81

49, 83

50, 82

51, 89

55, 102

57, 107

55, 97

LOWS AND HIGHS, SAN LUIS OBISPO AND COASTAL VALLEYS

SUN

MON

TUE

WED

THU

FRI

SAT

SUN

49, 70

49, 72

51, 71

52, 75

54, 77

57, 81

58, 84

54, 81

John Lindsey is a retired PG&E marine meteorologist. Email him at *****@*****.tld or follow him on X @PGE_John.

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