Potomac River - Saint Patricks Creek Entrance UV IndexUnited StatesMDSt Marys CountyPotomac River - Saint Patricks Creek Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAPotomac River - Saint Patricks Creek Entrance UV forecast issued yesterday at 3:18 pm. Next forecast at approx. 3:18 pm.Get WillyWeather+ to remove ads