You should come to the Okanagan or some other southern BC valleys, weather is suppose to be mainly sunny and between 27 to 32 the next 7 days in the forecast. (I am guessing warmer in the southern Okanagan).
Haynes Point is the best for heat, rate on Osoyoos lake, also there are some great campgrounds just north of Penticton along the 97 on Okanagan lake.
That is where I go every year. In fact was in the Okanagan 3 times this summer, this is why I love living in Vancouver, it is only a 3.5 hour drive away on freeway.