Temperatures back to normal soon

San Francisco and the Peninsula are expected to cool down to at least more reasonable temperatures after a preliminarily record-setting heat wave.

Temperatures in San Francisco will be reach highs of 78 degrees today and will “plummet” down to 70 degrees on Saturday, said Diana Henderson, a forecaster with the National Weather Service. The beginning of next week could be even cooler, with highs in the upper 60s and low 70s.

Temperatures should be in the upper 60s to lower 70s for Sunday’s Bay to Breakers race in The City.

Midday temperatures in San Francisco on Thursday showed preliminary readings of 93 degrees, which would top the previous May 15 high of 91, Henderson said.

On the Peninsula, temperatures will still reach as high as 88 today, with highs in the 70s and mid 80s through the weekend. A preliminary reading at San Carlos Airport also showed 93 degree heat, she said.

Temperatures are typically in the mid to upper 60s this time of year in this area, Henderson said. Excessive heat warnings will likely be in effect today as they were through 8 p.m. Thursday.

mrosenberg@sfexaminer.com

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