Unfortunately, overwatering produces symptoms similar to underwatering. If an azalea is too wet for any length of time, the roots will rot and the leaf tips will turn brown as a sign of distress. Too little water also results in brown leaf tips, usually preceded or accompanied by a wilted, limp appearance.

Your azaleas - not yet fully established - may have been reacting to heat stress, without a photo it's hard to make a guess.

Regular applications of bone meal are generally not recommended for azaleas - the ph is wrong for mainting the right soil acidity, high levels of phosphorus in the soil can lead to chlorosis over time.

You could use the finger method to see if you need to change your watering schedule going forward. For 1-2 weeks, check the soil moisture at the same time every day by inserting a finger to a depth of 4". If it feels moist, do nothing. If it feels dry or almost dry, water the plant and make a note on a wall calendar. If it feels wet, try to determine what is causing the soil to be wet and take whatever action seems appropriate.

After a week or two then review your notes in the calendar and determine how often you were watering. Then set the sprinkler or drip irrigation to water on the same frequency.

If the temperatures change by 10-15 degrees and stay there, recheck using the finger method and adjust the amount of water an/or frequency if you need to.