Fishing for largemouth bass in the summer is not like fishing any other time of the year. The high temperatures and the humidity are something with which a angler has to deal.
The hot air temperatures also mean the water temperatures of a lake will be high. Largemouth bass do not like to stay in shallow hot water areas for several reasons. First thing is that hot shallow water has a very low dissolved oxygen level and not a lot of breathable water for a bass. When a largemouth bass is exposed to this type of environment, it will become stressed and will become very nonactive and develop what some fisherman call lockjaw, meaning the bass will not feed much.
A bass will not stay in this type of shallow water area long till it will move to deeper, cooler water. This deeper, cooler water has a much better oxygen level content and bass will hold on cover and feed much better. So the smart angler will target these types of areas to do their summertime bass fishing.
When I say deeper water, this may only be a few feet deeper on a shallow lake or 20 feet plus on deeper, clear water lakes. On lakes that have very clear water, the sun will penetrate deeper into the water and cause bass to go deeper to find cooler water. On a lake that has murky to stained water, the cooler water will not be as deep. So use this information to pick your fishing depth at the lake you will be fishing.
Some good, deep water areas to fish include cover like brush piles, downed trees, weed lines, and good structure areas include creek channels, secondary dropoffs from a flat or steep bank, a bluff or cliff line, the deep side of a point, or where the channel runs close to the bank. All of these are topnotch places to fish for summertime bass.
Some good lures to fish deeper water areas include medium to deep diving crank baits, slow rolled willow leaf spinner bait, or a blade type bait like a silver buddy or a rattling bait like a rattle trap. These are good baits to fish in areas that have some open water with cover.
Try to fish the bait as close to the cover as you can and work the bait with a pause in your retrieve and then take off again. This erratic type action looks like a injured bait fish and will trigger a impulse strike from a bass.
If you are fishing in heavy cover, use a slower style bait like a worm or a jig. These baits can be worked tight to the deeper cover. This is a big bass way to fish also. You can also move out to where the bank drops off into deeper water and work a bait like a jigging spoon. This is good when summer bass school off of a dropoff .