The season’s first frost advisory for the San Francisco and Monterey Bay areas has been issued for this evening and tonight, according to National Weather Service officials.
The frost advisory went into effect at 3:45 p.m. for North Bay interior valleys in Napa and Sonoma counties, as well as the Southern Salinas Valley in Monterey County. The advisory expires at 8 a.m. Thursday, according to weather officials. The cold temperatures will probably occur sometime between shortly before and shortly after sunrise.
Temperatures in the affected areas will be in the mid to upper 30s. The temperature in Santa Rosa is expected to drop to 35 degrees, while Napa residents can expect temperatures around 37 degrees, according to weather officials.
Though some North Bay locations could see freezing temperatures, other locations in the San Francisco and Monterey Bay areas are expected to dip into the 40s. Fruits and vegetables in the advisory areas may experience a light frost and outdoor pets may need more help than usual staying warm.
Temperatures are expected to rise slightly on Thursday, but weather officials will be watching for more cold temperatures again.