The heat wave is bringing the highest Bay Area temperatures ever recorded

According to initial reports, the hottest temperature ever recorded in Bay Area history was set Monday during the Labor Day weekend heat wave.

In a phone call with SFGATE, National Weather Service Bay Area meteorologist Rick Kaneba said three different Bay Area cities set or matched their all-time September highs.

In Gilroy, the temperature reached 112 degrees, matching the previous high for September.

In Santa Rosa, the mercury hit 112, breaking the previous September high.

In Livermore, the temperature was recorded at 116 degrees — the highest the National Weather Service Bay Area has ever recorded for any part of the Bay Area.

To cool off during a San Francisco Bay Area heat wave, people enjoy playing in the water at Sausalito Beach on September 5, 2022 in Sausalito, California.Douglas Zimmerman/SFGATE

Accordingly, the 116 mark was also installed in Fairfield San Francisco Chronicle meteorologist Jerry Diaz.

(SFGATE and the San Francisco Chronicle are both owned by Hearst but operate independently of each other.)

As the Bay Area braces for an unusual heat wave over the past few days, temperatures on Monday were higher than many expected.

“It may have been warmer in some places than people predicted,” Kaneba said.

Downtown San Francisco (which is now included in a heat advisory) reached 91 degrees Monday, not close to its September record of 106 degrees. Temperatures topped 100 degrees in Oakland, nine degrees shy of its all-time September high.

And it might be hotter tomorrow.

To cool off during the heat wave, people go to Sep.  5, 2022 closed Sausalito Beach in Sausalito, California.
To cool off during the heat wave, people go to Sep. 5, 2022 closed Sausalito Beach in Sausalito, California.Douglas Zimmerman/SFGATE

“You can expect temperatures ranging from 100 degrees or more in many places to very hot (temperatures tomorrow). Conditions are forecast to be similar to today,” Kaneba said.

Temperatures may drop slightly on Wednesday, at least near the coast. But domestically, the maximum may last longer.

Temperatures are expected to drop across the Bay Area by the end of the week.

To cool off during the heat wave, people go to Sep.  5, 2022 closed Sausalito Beach in Sausalito, California.
To cool off during the heat wave, people go to Sep. 5, 2022 closed Sausalito Beach in Sausalito, California.Douglas Zimmerman/SFGATE

To cool off during a San Francisco Bay Area heat wave, people will head to Sept.  5, 2022 closed Sausalito Beach in Sausalito, California.
To cool off during a San Francisco Bay Area heat wave, people will head to Sept. 5, 2022 closed Sausalito Beach in Sausalito, California.Douglas Zimmerman/SFGATE

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