Napa County Regional Park District - Lake Hennessey City Recreation Area UV IndexUnited StatesCANapa CountyNapa County Regional Park District - Lake Hennessey City Recreation Area1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAANapa County Regional Park District - Lake Hennessey City Recreation Area UV forecast issued yesterday at 12:17 pm. Next forecast at approx. 12:17 pm.Get WillyWeather+ to remove ads