Sacramento River - Threemile Slough Entrance UV IndexUnited StatesCASacramento CountySacramento River - Threemile Slough Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAASacramento River - Threemile Slough Entrance UV forecast issued yesterday at 11:17 am. Next forecast at approx. 11:17 am.Get WillyWeather+ to remove ads