San Francisco Bay - Sandpiper Spit UV IndexUnited StatesCAContra Costa CountySan Francisco Bay - Sandpiper Spit1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAASan Francisco Bay - Sandpiper Spit UV forecast issued today at 12:17 pm. Next forecast at approx. 12:17 pm.Get WillyWeather+ to remove ads