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 yesterday at 3:19 pm. Next forecast at approx. 3:19 pm.Get an account to remove ads