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Plumes of steam can be seen appearing over Mt Ruapehu's Crater Lake, and it has been happening for the last two days.

Footage recorded on August 29 facing the mountain shows steam expanding as the colder air mixes with different temperatures.

The lake is recorded at a temperature of thirty-seven degrees Celsius, which is why the clouds grow.

A GeoNet statement says, according to MetService, local air currents flow up over the mountain and over the hot lake, which causes clouds of steam to form.

There's no volcanic activity happening in the lake. In addition, no seismic activity has been recorded.

It is not unusual for the clouds to form.

Image/Video: GeoNet

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