Coastal Flooding, Rain To Haunt Bay Area Halloween Weekend

Some coastal flooding could threaten shorelines through Sunday, while forecasters monitor possible Saturday rain.

By Angela Woodall, Patch Staff

Oct 30, 2026 11:57 AM PDT

Rising tides could flood coastal roads, push waves farther up beaches, and create dangerous conditions for Bay Area residents through Sunday. (Caren Lissner/Patch)

BAY AREA, CA — The Bay Area is in store for a wet weekend with drizzle greeting the Halloween ghosts and ghouls and flooding threatening coastal communities.

The National Weather Service warned Friday that high tides, combined with additional water from rising sea levels could cause coastal flooding in parts of the Bay Area and Pacific coast. Already this week, unusually high tides flooded San Francisco streets.

In an advisory issued early Friday, forecasters said high tides could flood low-lying shorelines, force isolated road closures, and accelerate coastal erosion.

Rising water and waves could also reach farther up beaches than usual, making it more difficult for people to leave coastal areas safely.

At the San Francisco tidal gauge, high tide was expected to reach 1.9 feet above normal at 2:39 p.m. Friday. Forecasters expect the level to reach 1.5 feet above normal Saturday afternoon and 1 foot above normal Sunday afternoon.

Forecasters cautioned that high tide times can vary by as much as 90 minutes along the coast and throughout the San Francisco Bay.

National Weather Service

Meanwhile, the weather service is tracking possible rain on Saturday, although forecasters said confidence remains low across much of the region.

Most areas face a 10-30 percent chance of Halloween rain, with expected rainfall totals ranging from a few hundredths to approximately one-tenth of an inch.

Monterey County could experience greater rainfall chances. Interior areas face a 50-70 percent probability of precipitation, while other areas in the two counties have up to a 50 percent chance.

Rainfall totals in the interior could reach one-tenth to one-third of an inch, forecasters said.

The weather service also expects rain chances to return next week, while temperatures should remain seasonal to slightly below seasonal through the extended forecast.

Officials advised coastal residents to allow extra travel time because of possible road closures, avoid driving around barricades or through floodwaters of unknown depth, and take steps to protect their properties from flooding.