River Derwent - South Arm Boat Ramp UV IndexAustraliaTASHobartRiver Derwent - South Arm Boat Ramp1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAARiver Derwent - South Arm Boat Ramp UV forecast issued yesterday at 10:07 pm. Next forecast at approx. 10:07 pm.Get WillyWeather+ to remove ads