Welcome to Kelowna, located in the Okanagan Valley, BC. urban and rural; nature and culture; playtime and downtime: Kelowna isn't just one destination. It's a whole bunch of them, located in one uniquely beautiful place. Kelowna lies in the heart of British Columbia's Okanagan Valley, the largest city on Okanagan Lake. From December through February, you can expect daytime highs to be around 4 °C. May through August, temperatures rise to 20 °C and higher.