Weather Advisory - Heavy Rainfall through Friday, December 26

Published on December 22, 2025

With the atmospheric river arriving, it is important to stay informed.

Are you signed up for AlertSCC? Make sure your information is correct to receive emergency alerts. 

Track power outages with PG&E's online tools, check stream and reservoir levels with Valley Water, and get updated weather forecasts with the National Weather Service. To protect your home, Valley Water also has sandbags available (see link for locations and guidelines).

Stay informed with the Cupertino Hazard Awareness Dashboard.

Important Reminder: Turn Around, Don't Drown! Never walk or drive through floodwaters.

The City of Cupertino continues its proactive response to storm mitigation. The City provides filled sandbags for residents to pick up from the Service Center, located at 10555 Mary Avenue. The City's Public Works Department staff will continue assessing the storm drainage system and clear any areas of concern.

Report downed trees or debris blocking roadways and storm drains by submitting requests on cupertino.gov/311.

The Cupertino Library will serve as a warming center this week. Click here for hours and information.