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 1:17 pm. Next forecast at approx. 1:17 pm.Get WillyWeather+ to remove ads