The National Weather Service issued a Coastal Flood Advisory for San Diego County’s coastal areas; the county said the advisory, issued Oct. 25, remains in effect through Thursday.

The county said some neighborhoods have already experienced flooding and that more coastal flooding is expected this week, with potentially record-breaking high tides.

High tides will occur every morning through Thursday, the county said, with peak tides possibly 1 to 1.7 feet higher than predicted; shoreline erosion is likely during morning hours and waves may reach farther up the beach.

More coastal flooding may affect roads, homes, businesses and critical infrastructure; residents should avoid the beach during high tide and stay well back from the ocean, rocks, jetties and cliffs.

If you live or work in a coastal or low-lying area, the county said, use sandbags or other barriers to prevent flooding; sandbag locations are listed by city in the El Niño 2026 Resources section of Alert San Diego.

The county linked a Sandbags 101 video showing how to fill and stack sandbags and urged people to follow posted signage or closures; do not cross flooded intersections, beach access points or pathways.

The county said drivers should not attempt to drive through floodwater and should turn around rather than risk being stranded.

El Niño conditions are expected to bring increased rainfall, more frequent storms and a heightened flood risk through fall and winter; the county said it is monitoring weather patterns and coordinating with regional partners and directed readers to the El Niño 2026 Information Hub for preparedness steps and available support.

Sources & methodology

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County of San Diego

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