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 yesterday at 12:17 pm. Next forecast at approx. 12:17 pm.Get WillyWeather+ to remove ads