Merrimack River - Shad Creek Entrance UV IndexUnited StatesMAEssex CountyMerrimack River - Shad Creek Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAMerrimack River - Shad Creek Entrance UV forecast issued today at 3:17 pm. Next forecast at approx. 3:17 pm.Get WillyWeather+ to remove ads