The National Weather Service has issued a Heat Advisory that will be in effect for much of the San Francisco Bay Area this weekend.

The advisory is for 11 a.m. Saturday through 10 p.m. Sunday for most of the region besides some coastal and North Bay areas because of a forecast of inland temperatures that could reach triple digits, according to the weather service.

Overnight low temperatures are expected to stay in the upper 60s to middle 70s in some parts of the region, limiting the opportunity for people to recover from the high temps, forecasters said.

A heat advisory map for the San Francisco Bay Area on Thursday, October 1, warns of high temperatures up to 103°F and advises staying hydrated and avoiding prolonged outdoor activity.
A NOAA graphic shows a heat advisory that has been issued across most of the interior areas of the San Francisco Bay Area and central counties of Calif., for Saturday, Oct. 3, and Sunday, Oct. 4, 2026. The Coastal Flood Advisory has been extended through Friday, Oct. 2, 2026. (NOAA via Bay City News)

The weather service advises people to stay hydrated, to not leave people or pets in unattended vehicles, and to shift outdoor activity to cooler times of the day.

Dan McMenamin is the managing editor at Bay City News, directing daily news coverage of the 12-county greater Bay Area. He has worked for BCN since 2008 and has been managing editor since 2014 after previously serving as BCN’s San Francisco bureau reporter. A UC Davis graduate, he came to BCN after working for a newspaper and nonprofit in the Davis area. He handles staffing, including coaching of our interns, day-to-day coverage decisions and management of the newswire.