Inner tubes, foreground, sit idle Monday morning on the beach at Martin Point in Sabattus as Tristan Boyd tries to catch a ball thrown by his friend Rhiley Lapan, middle, while his sister Elise Boyd watches. The heat and humidity moved into Maine on Labor Day and is expected to last through midweek. Russ Dillingham/Sun Journal

Robbin Hollis, left, and Elias Mohamed, center, look at a great blue heron Monday morning as their guardian, Edmund Waite, steers his electric kayak around Sabattus Pond. They had just launched at Martin Point where a steady stream of boats were coming and going to enjoy Labor Day. Russ Dillingham/Sun Journal