Based on the Köppen climate classification, Mount Smuts is located in a subarctic climate with cold, snowy winters, and mild summers. Temperatures can drop below −20 °C with wind chill factors below −30 °C. In terms of favorable weather, July through September are the best months to climb. Precipitation runoff from the mountain drains west into Spray River, or east to Smuts Creek, both of which empty into Spray Lakes Reservoir.