Potomac River - Weir Creek Entrance UV IndexUnited StatesMDCharles CountyPotomac River - Weir Creek Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAPotomac River - Weir Creek Entrance UV forecast issued yesterday at 5:17 pm. Next forecast at approx. 5:17 pm. UV IndexGet WillyWeather+ to remove ads