A heat wave is driving temperatures 5 to 15 degrees above normal across San Francisco and the greater Bay Area.

Highs could reach up to 100 degrees in parts of the East Bay, the mid to upper 90s along portions of the San Francisco Bay shoreline and in the Santa Clara Valley, and the mid to upper 80s in eastern San Francisco.

“The warmest part of the day for the city of San Francisco and adjacent shoreline will be late morning through mid-afternoon, when a return of weak onshore flow is expected to bring some relief,” the National Weather Service said.

A heat advisory is in effect through 7 p.m. Tuesday, Sept. 23. A pattern change will occur later tonight with the return of unsettled weather with possible rain and thunderstorms across the Central Coast into early Wednesday, Sept. 24.

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