The marine layer is a cool, moist air layer that forms near the ocean surface, typically extending 750 feet in depth, which creates cooler coastal temperatures (upper 50s to mid 60s) while inland areas experience significantly warmer conditions (upper 80s to lower 90s). This temperature differential occurs because the marine layer acts as a temperature barrier, and its depth and strength directly influence daytime heating and overall weather patterns. During the afternoon and early evening, onshore winds develop due to diurnal heating differences between land and ocean, with gusts potentially reaching 30 mph. When low clouds hover near the coast, stratus clouds can spread inland through geographic features like the Golden Gate and into valleys such as the Salinas Valley.
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Deep Dive
Marine Layer ReturnsAdded:
HERE IS A LOOK AT HIGH TEMPERATURES ACROSS THE AREA FROM EARLIER TODAY. THE SANTA CRUZ MOUNTAINS AND COASTAL AREAS FROM SANTA CRUZ TO APTOS, THE SALINAS VALLEY INCLUDING SALINAS, SOLEDAD, GONZALES, KING CITY, AND THE SANTA CLARA VALLEY INCLUDING MORGAN HILL AND GILROY ATED AT 256 PM PDT WED MAY 20 2026 - DIURNALLY DRIVEN WINDS, WITH ONSHORE WINDS DURING THE AFTERNOON AND EARLY EVENING.
- WARM AND DRY WEATHER THROUGH THURSDAY LEADS TO ELEVATED FIRE WEATHER CONCERNS FOR THE INTERIOR BAY AREA AND CENTRAL COAST.
- ABOVE NORMAL TEMPERATURES CONTINUE THROUGH MIDWEEK WITH SEASONAL TEMPERATURES RETURNING BY THE UPCOMING WEEKEND.
A DEEPER MARINE LAYER, ñ750 FT IN DEPTH, AND STRATUS HAS RESULTED IN COOLER CONDITIONS NEAR THE COAST SO FAR THIS AFTERNOON. TEMPERATURES THERE ARE IN THE UPPER 50S TO MID 60S. HOWEVER, INLAND AREAS ARE WELL ON THEIR WAY TO THE UPPER 80S TO LOWER 90S.
BREEZY ONSHORE WINDS ARE LIKELY TO INCREASE THIS AFTERNOON AND PEAK EARLY IN THE EVENING WITH GUSTS UP TO 30 MPH BEFORE EASING OVERNIGHT. WITH LOW CLOUDS HOVERING NEAR AND ALONG THE COAST, EXPECTING A GREATER POTENTIAL FOR STRATUS TO SPREAD INLAND THROUGH THE GOLDEN GATE AND INTO THE SALINAS VALLEY TONIGHT AND INTO THURSDAY MORNING.
FOR THURSDAY AFTERNOON, EXPECTING LITTLE CHANGE COMPARED TO TODAY WITH MOSTLY SUNNY SKY CONDITIONS ACROSS THE INTERIOR. THE HIGHER ELEVATIONS ABOVE 1000 FEET WILL REMAIN CRITICALLY DRY WITH WITH POOR OVERNIGHT HUMIDITY RECOVERIES.
TEMPERATURES ON FRIDAY WILL HEAVILY DEPEND ON HOW DEEP THE MARINE LAYER BECOMES AS THE BAY AREA AND CENTRAL COAST REMAINS BETWEEN THE HIGH PRESSURE TO THE WEST AND TROUGHING TO THE EAST.
THE STRONGER THE MARINE LAYER, THE LESS TIME THERE IS FOR DAYTIME HEATING TEMPERATURES GRADUALLY COOL OVER THE WEEKEND AS TROUGHING DEVELOPS TO THE NORTH.
THEN, COOLER AND POTENTIALLY UNSETTLED WEATHER RETURNS FOR EARLY NEXT WEEK AS THE AFOREMENTIONED TROUGH DROPS SOUTHWARD ACROSS THE WEST COAST. AS SUCH, THE 6-10 DAY TEMPERATURE OUTLOOK FROM THE CPC INDICATES TEMPERATURES LEANING BELOW AVERAGE WITH THE SAME OUTLOOK FOR PRECIPITATION LEANING ABOVE. AGAIN, ABOVE AVERAGE FOR THIS TIME OF YEAR MAY BRING EITHER DRIZZLE AND/OR VERY LIGHT RAIN TO THE REGION AS WE GO DEEPER INTO OUR "DRY SEASON".
HAZARDOUS CONDITIONS FOR SMALL CRAFT WILL CONTINUE THROUGH THURSDAY FOR THE NORTHERN OUTERS DUE TO ROUGH SEAS AND STRONG NORTHERLY BREEZES.
ELSEWHERE, MODERATE NORTHWESTERLY BREEZES AND MODERATE SEAS WILL PREVAIL. CONDITIONS IMPROVE INTO THE WEEKEND AS SEAS AND NORTHWESTERLY BREEZES BECOME MODERATE.
SATELLITE IMAGERY SHOW WHERE THE CLOUDS AND HIGH AND LOW PRESSURE SYSTEMS ARE AND IF ANY RAIN IS HAPPENING IN THE STATE CURRENTLY HERE IS A LOOK AT STATE TEMPERATURES.
HERE IS A LOOK AT THE STATE SATELLITE OVERVIEW. YOU CAN SEE WHERE THE CLOUDS, RAIN AND SNOW ARE ON THE MAP.
FUTURECAST SHOWS WHEN THE CLOUDS AND RAIN MAY ARRIVE IN THE COMING DAYS. ALONG THE WEST COAST AND CALIFORNIA SUNSHINE AND AREAS OF BAY FOG FOR THE HERE IS YOUR KSBW WEATHER QUIZ FOR TODAY AGAIN... READ QUESTION AND ANSWERS ON GRAPHIC.
CORRECT ANSWER IS THE REMAINING ONE SHOW
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