A ridge of high pressure and an offshore flow of air are causing the atmosphere above the region to heat up, meteorologist Bob Benjamin said.
The resulting high temperatures could break records in Oakland and San Francisco, Benjamin said.
The record high in San Francisco was 82 degrees set in 2000, Benjamin said.
This afternoon, the temperature is forecast to reach 83 degrees in the city, according to the weather service.
Oakland’s record high was also set in 2000 when the temperature reached 80 degrees, Benjamin said. Today’s forecast high for the East Bay city is 82 degrees.
Forecasts call for temperatures to climb to within a few degrees of record highs in Napa, San Jose, Santa Cruz and Monterey, Benjamin said.
The combination of regional high pressure and offshore wind is not unusual for spring, Benjamin said, and this week’s warm conditions are not likely to last.
Temperatures across the Bay Area are forecast to fall to the lower to mid 60s over the weekend, Benjamin said.