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LIVERMORE, Calif. –
According to the National Weather Service, an excessive heat warning is in effect across much of the Bay Area through Wednesday evening, as temperatures could reach 110 degrees in some inland locations and as high as 96 degrees in downtown San Francisco.

On Tuesday, early afternoon temperatures were in the triple digits in places like Olema Valley in Marin County, which reached 104 degrees as of 1 p.m. and 100 degrees in Livermore

The hot weather will continue Wednesday and will be accompanied by some offshore winds at speeds of 20 to 30 mph, prompting the weather service to issue a red flag warning for parts of Monterey County from 3 a.m. Wednesday through 8 p.m. Thursday inland and other nearby regions.

The Bay Area Air Quality Management District also issued a “spare the air” warning for Wednesday, the third day in a row, as health-damaging levels of smog are expected in the region.

Predicted high temperatures for Wednesday include 108 degrees in Concord, 106 in Livermore and 104 in San Rafael, according to the weather service, which said that day in October is expected to break daily high temperature records in many places in the Bay Area on Tuesday and Wednesday .

The weather service encourages area residents and visitors to never leave people or pets in hot cars, limit outdoor activities in the afternoon and evening, stay hydrated and take cool-down breaks.

Forecasters expect a gradual cooling to occur later in the week, but some inland locations will still see temperatures in the high 90s to low 100s through the weekend before a widespread cooling early next week is expected.

“Simply put, this is a long-duration heat event and people need to keep in mind that heat-related illnesses are cumulative and impacts will persist,” the weather service said Tuesday afternoon.