SAN FRANCISCO (KRON) — As the winter weather ramps up in the Bay Area, the temperatures are about to go down.

KRON4 Weather Radar

Downtown San Francisco has the potential to drop below 40 degrees Tuesday morning, according to the National Weather Service Bay Area.

The agency says it would be the first time the city’s temperature dropped that low since Jan. 6, 2017 — nearly five years ago.

According to NWS, other predicted Tuesday morning lows include Concord at 35 degrees, Napa at 32, San Jose at 36.