Potomac River - Wicomico River (Potomac) Entrance UV IndexUnited StatesMDSt Marys CountyPotomac River - Wicomico River (Potomac) Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAPotomac River - Wicomico River (Potomac) Entrance UV forecast issued today at 3:17 pm. Next forecast at approx. 3:17 pm.Get an account to remove ads