A few tips

*Dress your baby lightly
Often just a plain shirt with a diaper/clothdiaper does the trick

*If you feel comfortable wearing your baby on your back you should do so. It really helps to combat the heat

* Choose babycarriers that are either designed with thin flowy cotton fabrics or choose solarweave and solarvail carriers.
Some of those carriers are even excellent to use in the pool, shower or beach.

* Choose lighter colors for the summer. For example a black babycarrier attracts more sun than lets just say a natural colored carrier.

* If you like wraps but find the fabric too much in the summer you might be interested in shorter style wraps. The Bara Barn is a short rebozo style carrier that is lightweight and perfect for summer babywearing.