Barnstable Harbor - Little Thatch Island UV IndexUnited StatesMABarnstable CountyBarnstable Harbor - Little Thatch Island1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAABarnstable Harbor - Little Thatch Island UV forecast issued yesterday at 2:17 pm. Next forecast at approx. 2:17 pm.Get WillyWeather+ to remove ads