Mount Sealy is located in the Southern Alps and the Canterbury Region of South Island.

Topographic relief is significant as the summit rises 1,050 metres (3,445 feet) above the Dobson headwaters in one kilometre.

[2] The mountain's toponym was applied by Julius von Haast to honour Edward Sealy (1839–1903), a New Zealand surveyor, photographer, and explorer.

This climate supports the Metelille and Sladden glaciers on the north and west slopes of the peak.

The months of December through February offer the most favourable weather for viewing or climbing this peak.