The summer months offer a welcome seasonal challenge to the trout angler. Throughout June, July and August it can be difficult to catch Rainbow Trout due to the warmer water temperatures and the reduced oxygen levels. Sustained heat over a number of weeks will usually result in the fish comfortable swimming in deep, colder water forcing those fly fishing for Rainbow Trout to adopt a sinking line. On large waters the depth at which trout can be found is often surprising. A longer leader, slow retrieve and the discipline to regularly change flies in a bid to find the fishing fly to attract attention.
Trout can still be found close top the surface, particularly in spring fed fisheries, or those with an aerator to add oxygen to the water. This can attract fish just below the surface. It is not uncommon for Rainbow trout to be lethargic and extremely difficult to entice. A patient approach with a team of buzzers at the correct depth is often a successful way to go fly fishing in hot weather.