Gwillim Lake, BC is deep, blue and cold. The average temperature from May and June is usually around 8 degrees Celsius. The water near the shore is shallow and is considerably warmer. The lake is fairly large and spans across 6 miles from one end to the other. Activities include canoeing, kayaking, waterskiing, swimming, hiking, and fishing. Anglers can try their luck for bull trout, lake trout, northern pike, mountain white fish, burbot and grayling.