Developing thunderstorms with the risk of dry lightning has prompted the National Weather Service to issue a Red Flag Warning for the San Francisco Bay Area and areas of Central California.
The Red Flag Warning in the Bay Area will remain in effect until 11 a.m. Monday, forecasters said.
Thunderstorms are likely in the South Bay and Santa Cruz regions Saturday night.
The thunderstorms are also expected over San Luis Obispo County and could also affect Monterey County.
According to the NWS, lightning due to thunderstorms increases the possibility of wildfire.
A Red Flag Warning means critical fire weather conditions are in place and with a combination of strong winds and low relative humidity, warm temperatures can contribute to fire behavior.
The California Governor's Office of Emergency advises to know the signs of heat-related illnesses and take precautions.
For a list of cooling centers open during the heat wave in the Bay Area, click here.