California starts the morning under low clouds and damp air as rain edges back into the San Francisco Bay Area. Pavement darkens, umbrellas reappear, and the city settles into a familiar December rhythm of wet commutes and gray skies.
According to the National Weather Service, rain chances increase through the day and remain elevated into Wednesday. Periods of light to moderate rain are expected, especially during the afternoon and evening hours. While rainfall totals stay modest, steady moisture may create slick roads and reduced visibility during peak travel times.
Drivers along U.S. 101, I-80, and I-280 should expect slower traffic as rain develops. Allow extra braking distance and watch for pooling water in low spots. Sidewalks and transit platforms may also turn slippery as showers pass through.
Temperatures remain seasonably cool, with highs near 59 to 61 degrees and lows dipping into the upper 40s. While freezing temperatures are not expected, the persistent dampness can make conditions feel colder, especially near the bay and along exposed streets.
By Thursday, rain chances briefly ease during the morning before returning later in the day. Clouds linger, and breezy conditions may develop near the coast. No snow is expected at sea level, but higher elevations inland could see wintry conditions later this week, signaling an early winter weather pattern across Northern California.
Looking ahead to the extended five-day outlook, rain chances continue into Friday and Saturday, with highs near 60 degrees. Nights stay cool, and repeated wet roads raise concerns for slick driving during early mornings and evenings. Sunday trends slightly drier but remains mostly cloudy.
Plan flexible travel, keep rain gear nearby, and expect changing conditions as December weather stays active.
