The Sundaise three day festival of music art and sustainability is starting today at Dickeys Flat campsite near Waihi.

Organisers are tweaking the site in expectation of the forecast of rain tonight and tomorrow.

'Some changes have been made to the camping areas to ensure we don't have people set up too close to the river,” says today's Facebook post.

'Currently on site the river is swift but a long way from flooding and there is almost no surface water on the site. We will keep you all posted with updates.”

Sundaise is a three-day celebration of music, art and sustainability set amongst native bush in a hidden valley near Waihi.

Sundaise provides a platform for emerging local performers along with some of New Zealand's most recognised artists and musicians.