Heat records tumbled left and right Tuesday as the Bay Area sizzled through a second day of unseasonably hot weather.

Just how rare is this late October warm-up? In 123 years of record-keeping, San Jose has hit the 90-degree mark just once on Oct. 24, according to the National Weather Service in Monterey. On Tuesday, the city cruised past that with a high of 94 degrees, breaking the previous record for the day set back in 1965.

Oakland, Mountain View, San Francisco’s airport and Half Moon Bay all shattered previous records, with highs of 92 in Oakland, Mountain View and Half Moon Bay and 91 at San Francisco’s airport.

“It’s pretty hot,” said John Smith, 18, of San Jose, as he left the Museum of Modern Art in downtown San Jose. “You don’t usually expect it to be this hot at this time of year.”

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There was no relief to be had at the coast. By 4:35 a.m., it was already 81 degrees in Half Moon Bay. In Santa Cruz, the mercury climbed to 97, just two degrees shy of the previous record set in 1965, according to the weather service.

“Typically we see this heat early in the month, not this late in” October, said Brian Mejia, a meteorologist with the weather service. He pointed to a ridge of high pressure over California and other states as the cause of the heat wave.

Tuesday marked the second day of unusually warm weather for late October, but forecasters are predicting some cooling Wednesday with more relief by the weekend.

Concord and Gilroy weighed in with highs of 92 degree. Morgan Hill and Livermore topped out at 91, and downtown San Francisco came within a degree of matching its previous record of 90 set in 1965.

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Across the Bay Area, temperatures are 10 to 20 degrees above normal for this time of year, said Anna Schneider, a meteorologist with the weather service.

But Joe Heimlich, who was in San Jose to attend the Association of Science-Technology Centers annual conference, said there is no such thing as normal anymore when it comes to climate.

“What we consider a norm means there is a center that we can predict to and then there’s variance around it that’s predictable. We’ve long passed that predictability of what is central,” said Heimlich, a professor emeritus at Ohio State University, where he taught in the environmental graduate science program.

“I think the extreme weather on both ends of the summer is pretty indicative,” the Columbus, Ohio, resident continued. “At home, we had a really cool August. It was cool. It was clear. It felt like October. Then September turned … very hot and the first of October felt like August.”

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Rita Deedrick, who also attended the conference, said it felt good to step out of the air-conditioned convention center into the heat.

“I was grateful for the warm weather,” she said. “But I did stop and think today about when I arrived a few days ago it was very cool and cloudy, and now it does seem unusually warm.”

Southern California also sweltered Tuesday. Downtown Los Angeles reached 104 degrees, breaking its previous record of 99 degrees set in 1909. It was 102 as the Los Angeles Dodgers hosted the Houston Astros for the first game of the World Series, besting the previous high for a World Series game set in 2001, when the Arizona Diamondbacks played the New York Yankees in 94-degree weather, according to the Los Angeles Times.

Temperatures in most Bay Area locations are expected to drop into the low 80s by Saturday and the upper 70s by Sunday. And the forecast for early next week calls for more seasonal temperatures, according to the weather service.