Excessive heat warning extends into weekend as late heat wave scorches Bay Area

An excessive heat warning has been extended for much of the Bay Area into the weekend, as a late season heat wave continues to bring record-breaking temperatures to the region.

The National Weather Service announced Thursday afternoon that the warning remains in effect for the North Bay interior and coastal ranges, the entire East Bay and South Bay, eastern San Mateo County and the Santa Cruz Mountains, along with interior Monterey County, the southern Salinas Valley and San Benito County until 11 p.m. Saturday.

Meanwhile, a heat advisory remains in effect for coastal regions, including San Francisco, along with the North Bay valleys and northern Salinas Valley, also until 11 p.m. Saturday.

"Hot and dry conditions continue with dangerous heat and potentially critical fire weather conditions for the remainder of the work week. The heatwave did peak the last couple of days, but impacts from Moderate to Extreme Heat Risk at times, will be felt into the weekend," said a Weather Service statement on Thursday.

KPIX First Alert Weather: Current conditions, alerts, maps for your area

On Wednesday, preliminary data showed at least three Bay Area communities set or exceeded previous temperature records for that date. In San Rafael, the high reached 106 degrees, tying the previous set in 1980.

Meanwhile in Napa, the high reached 103 on Wednesday, breaking a record also set in 1980 of 102 degrees.

In San Jose, the high on Wednesday reached 106 degrees, breaking the day's record of 96 degrees set in 1980 and 2012.

According to CBS News Bay Area Chief Meteorologist Paul Heggen, Wednesday's high is the hottest recorded October temperature ever in San Jose and the 8th hottest since record-keeping began in 1893. The hottest temperature in San Jose ever recorded was 109 degrees, set back in Sep. 2022.

The Weather Service said relief from the heat may begin early next week, but temperatures are expected to stay above normal for interior locations.