The time has come for swimming.
Wanganui highs have been at or above 20C since November 17 and people are taking to the water.
Even the water temperature at Wiritoa Lake has been at 20C the last two weeks.
Algae levels are creeping up at both Wiritoa and Duddings lakes.
They are not toxic, but swimmers should avoid going in where there is a surface scum because that means algae numbers are especially high.