I would say 12C - 15C. The creek — Wing Creek — running through the property flows all year long as well. Note that between October 1 – April 30 Highway 3 & 3-A  are designated as winter tire/chain routes, and it is mandatory for all vehicles travelling on them to use winter-rated tires. As I got older and chicken, I stayed out of the water for swimming but I did go in but never past my knees ( grin) ! The locals figure because of the early run off and the low snow pack has helped make the lake warmer. You answered one from 2015, I'm sure the original poster has long since travelled to Kokanee. Fishing is terrible on the lake, but that's another story. Kootenay lake is always the coldest lake around here, not counting high altitude lakes. Table 1: Kootenay Lake average water temperatures by month Water temperature April May June July August September October Highest Temperature 8 13 16 24 22 20 14 Lowest Temperature 5 8 5 6 11 7 10.5 Average Temperature 6.6 9.18 12.1071 16.18542 18.7775 16.74615385 11.4583333 Replicates 5 … can't find on the web...what is the average temperature of the water along the beaches at kokanee creek provincial park in july. I have a water temperature gauge on my boat it read 70-72, depending on where I was on the lake. Variations in the water level—from vernal floods, to seiches, through eolian waves, and cat’s paw prints—are all weather driven. The day of the year with the warmest water is August 10, with an average temperature of 86°F. Kootenay Lake shines in the summer, from dawn to dusk. Kootenay Lake is the largest inland freshwater lake in southern BC bordering Idaho state and easily acceesed via Calgary, Banff , Invermere, Cranbrook, Nelson , Creston and Spokane Washington. I was there from July 7th-July12th. Members who are extremely knowledgeable about this destination and answer travellers’ questions frequently. When we monitor the mountain rivers, we are seeing close to single digit temps…hence why I feel a cool lake like this will probably mid to low teens? Last I swam there it was cold as the grave. The moods of the Lake are largely a reaction to the weather. The average surface water temperature in Marco Island is essentially constant during July, remaining within 1°F of 85°F throughout. Also, make sure your vehicle is winter ready - always carry an emergency kit and have clothing available appropriate to the weather that you will experience outside your vehicle. I belive your refiring to Kootenay lake which is the lake that Kokanee creek Povinacal campground is at. Get the monthly weather forecast for Kootenay Bay, British Columbia, Canada, including daily high/low, historical averages, to help you plan ahead. Under the IJC’s 1938 orders, the board must oversee a drawdown period from January until April and until temperatures lead to the spring rise conditions on Kootenay Lake. All my kids swam in Kootenay lake as well and now they sit beside me on the beach watching their kids ( my grand kids) swim. Mid-July through September is far warmer, averaging closer to 25C (82F). How nice it was to have summer temperatures and great days fishing both on Kootenay's main lake and on the West Arm. Kootenay Bay, British Columbia 39° F But for the exact temp I couldn't tell you as I will continue to sit at shore and watch the youngsters play in that lake. With the warmer temps this spring / summer all the lakes are warmer earlier than usual. General This is the wind, wave and weather forecast for Nelson/Kootenay Lake in British Columbia, Canada. thanks. Lake, mountains, clouds, and forests. 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