June is the boat fishers paradise. If you cover the water and are prepared fly wise, then there should be no problem is securing first class sport. Freak weather conditions can disrupt sport about once every ten years, and when that happens you had either better treat the month like August, or get back to the banks.
When the days start to heat up, daytime temperatures can see the water temperature rising to above that which the trout fish pleasant. Remember how in April, we talked of the fish moving actively in, and searching for, the warmer water? Well now things are beginning to change and the trout actually prefer the cooler water. So now the idea is to get upwind and expect most of your fishing to be up there. There are exceptions of course, but the further into the summer we go, the more the rule will apply.
Here are the methods:
Dries: Always my first approach and a great starting point. Shipman's, sedges, GRHE's and suspenders; all in sizes #12 through#16 are standard. This method accounts for 90% of my June catch. Master it.
Pin fry feeders at the start of the month: fry patterns in appropriate sizes fished on the drift, close to weed banks, when the fish are on to them.
Fry feeders a little later: white lures close to surface and side sweeping in late evening, and floating fry picks up fish turned on to fry.
Inducing the take in the evening; intermediate lines, sedges pupa, Cove pheasant tail and white lure as for May.
Daphnia feeders, as May, cloudy dull days see daphnia high in the water, fish hot orange. Bright days go deep with lime green.
Nymphs on floater: buzzers, sedge pupa and damsel fished on the drop and little else.
Wets on floater, dibbled the surface can out fish dries, in all but pleasure.
Wets on intermediate; pulling flies can catch fish during the a day when they are down a little.
Dry skated sedge in the evening starts to pick up fish.
Black lure in the last 10 minutes can put three fish in the boat if you know about it, and now you do. I know anglers who keep a rod ready set up for this purpose.
All these methods can and will work at one stage or another. Often no one method is the answer, and its simply a matter of choice on the part of the angler. For me I tend to choose dries and change as the fish dictate. Basically when the dries are failing I start to think. The secret is to keep changing drifts until fish are found.