San Francisco Bay - Hercules, Refugio Landing UV IndexUnited StatesCAContra Costa CountySan Francisco Bay - Hercules, Refugio Landing1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAASan Francisco Bay - Hercules, Refugio Landing UV forecast issued today at 12:17 pm. Next forecast at approx. 12:17 pm.Get WillyWeather+ to remove ads