Napa River - Fagan Slough Entrance UV IndexUnited StatesCANapa CountyNapa River - Fagan Slough Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAANapa River - Fagan Slough Entrance UV forecast issued today at 11:17 am. Next forecast at approx. 11:17 am.Get WillyWeather+ to remove ads