Hayden Hill-Silva Flat State Game Refuge UV IndexUnited StatesCALassen CountyHayden Hill-Silva Flat State Game Refuge1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAHayden Hill-Silva Flat State Game Refuge UV forecast issued today at 11:17 am. Next forecast at approx. 11:17 am.Get WillyWeather+ to remove ads