SF Bay Area heatwave will bring 90-degree weather to these cities

A strong ridge of high pressure on the west coast will push temperatures into the upper 80s and below the 90s on Thursday, the National Weather Service said.

Record high temperatures are possible in Santa Rosa, Livermore, Redwood City, Oakland, San Jose and Gilroy, said weather service meteorologist Brian Garcia.

“It’s going to be another thirsty day in the Bay Area,” Garcia said.

The hottest conditions Thursday were expected in the Santa Clara and East Bay Valleys and parts of Napa County where temperatures are expected to hit the low to mid-90s, weather officials said. The cities of St. Helena, Concord and Morgan Hill could experience a high of 91 degrees on Thursday, according to the weather service.

Even coastal cities will feel the heat. Downtown San Francisco could see a high of 86 degrees; Half Moon Bay a high of 79 degrees; and Bodega Bay a high of 76 degrees.

However, Bay Area residents could see a drastic change in temperatures overnight as an onshore runoff could develop Thursday night, weather officials said.

“As soon as that land breeze kicks in, we’re going to see those temperatures drop probably 10 degrees,” Garcia explained.

Residents were urged to stay hydrated, wear light-colored clothing, avoid outdoor activities if possible, and monitor vulnerable populations.

“Do not leave people or animals in cars in the heat. It’s a bad idea,” Garcia said. “Let’s get through this heat event with everyone alive.”

Garcia said the weather service will monitor potential fire danger this weekend given land breezes and dry vegetation that could make it easier to start and spread a fire. A wind advisory could be issued, Garcia said.

Once conditions start to cool on Friday, get ready to get the blankets and sweaters out. Temperatures are expected to drop between 15 and 25 degrees this weekend with a small chance of light rain on Monday, weather officials said.

“Just because we have the heat today doesn’t mean we shouldn’t expect to be cold over the weekend,” Garcia said.

Jessica Flores (her) is a staff writer for the San Francisco Chronicle. Email: jessica.flores@sfchronicle.comTwitter: @jessmflores

About Adam Motte

Check Also

The bodies that washed up in Wales 40 years ago and have never been identified

Bodies found off the Welsh coast 40 years ago have still not been identified. The …