The final day of March felt more like August with high temperatures in the 80s for many areas.
NBC Bay Area meteorologist Christina Loren said that records would fall and they did.
Santa Rosa hit a record high of 86 degrees, beating the 2000 record of 83 degrees.
Napa also hit a record high of 87 degrees, beating a record held since 1966 by one degree.
The National Weather Service in Monterey said no one hit 90.
All of the hot weather was thanks a ridge of high pressure that forced something forecasters call an off-shore flow.
This is going to be a short lived heat wave, with cooler temperatures by the weekend.