An Excessive Heat Warning will be in effect Saturday and Sunday for areas inland, before a widespread cool-down arrives Monday.
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MORE: Spare the Air Alert in effect for Bay Area on Friday, air quality district says
Even though there are no watches or warnings for Friday, temperatures will feel noticeably warmer. We still expect our hottest cities to be well into the 90s if not 100 degrees on Friday afternoon.
MORE: Bay Area officials warn residents to plan ahead of intense heat wave
The National Weather Service is estimating about 3.5 million folks in the Bay Area will be under the Excessive Heat Warning.
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They say to never leave children and pets in vehicles, and stay hydrated.
Daytime relative humidity will be in the low teens inland, creating elevated fire danger.
MORE: East Bay firefighters on high alert for increased fire danger this weekend
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ABC7 Meteorologist Drew Tuma says across California, only the immediate coastline will be spared from the dangerous heat.
Most of the state will have Excessive Heat Warnings and Heat Advisories, and the hottest places like Death Valley could even reach 130 degrees.
Watch the latest AccuWeather forecast and take a look at recent weather stories and videos.