National Parks and Wildlife Service area manager Alan Henderson said the island's annual August weed control and maintenance program is aimed at supporting nesting seabird habitat.

"With amazing shorebirds on Montague Island, it's important weed control works are intensive and carried out when birds like the little penguins, shearwaters, petrels and terns are not nesting.

"Closing the island to tours during August allows us to focus on this essential work.

"Supported by the Saving Our Species program, the works targeted Kikuyu Grass, Dolichos Vine and Coastal Morning Glory Vine patches growing in remote locations on the island.

"This is not your average Saturday morning yard clean up, with the use of the Park Air helicopter required to assist us in accessing remote parts of the island with essential equipment.

"The island also now has a more efficient, reliable and modern power system after the connection of a solar upgrade in conjunction with solar panels, battery system and back-up generator.

"We are pleased to have reopened and welcome day tours and overnight guests back to this little piece of paradise," Mr Henderson said.