Saint Johns River - Mayport (Bar Pilots Dock) UV IndexUnited StatesFLDuval CountySaint Johns River - Mayport (Bar Pilots Dock)1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAASaint Johns River - Mayport (Bar Pilots Dock) UV forecast issued today at 1:05 am. Next forecast at approx. 1:05 am.Get WillyWeather+ to remove ads