Sunday's rainfall total of 4.02 inches recorded in downtown San Francisco places it fourth on the city's list of wettest days ever and sets a record for wettest October day.
The city's highest rainfall total for a single day is 5.54 inches recorded on Nov. 5, 1994.
Sunday's total breaks the previous high for October, which was 2.48 inches recorded on Oct. 13, 2009.
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Before Sunday, seven of the 10 highest totals were recorded in the 1800s, according to a list of totals recorded since 1849 and shared by the National Weather Service.
The service began releasing rainfall totals about 1:30 a.m. Monday.
In Sacramento, the 5.44 inches recorded there broke the previous record of 5.28 inches set in 1880.
More totals from around the Bay Area will be reported as they become available.