Precipitation runoff from the peak and meltwater from the glaciers drains into Wedgemount Lake and tributaries of the Lillooet River.

Originally known by the mountaineering community as Armchair Mountain or The Armchair, the Garibaldi Park Board submitted the name "Mount Weart" in 1928, after their board's chairman at the time, John Walter Weart (1861–1941).

[3] The mountain's toponym was officially adopted on September 2, 1930, by the Geographical Names Board of Canada.

[5] Most weather fronts originate in the Pacific Ocean, and travel east toward the Coast Mountains where they are forced upward by the range (orographic lift), causing them to drop their moisture in the form of rain or snowfall.

As a result, the Coast Mountains experience high precipitation, especially during the winter months in the form of snowfall.