River Tamar - St John's Lake Entrance UV IndexUnited KingdomSWCornwallRiver Tamar - St John's Lake Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAARiver Tamar - St John's Lake Entrance UV forecast issued yesterday at 6:52 pm. Next forecast at approx. 6:52 pm.Get WillyWeather+ to remove ads