If its 30c then i'm wet wading but i don't go in past my knees.As evening comes around i put on my breathables.Bowriver water is very hard,after a day of wet wading your legs will be very dry.
With the water a little dirty I use straight 6 or 8lb maxima on my nymphs,if it fits in the eye then your good.Last time out i caught a fish on an 18 midge with 6lb Maxima.On a big stone nymph you could use 10lb