My first Blue Dream'matic (First Grow)

This week the buds have begun to gain weight and grow a little more. I have had some problems with the lower leaves, they turn yellow and begin to dry. I'm not sure if it's due to lack of water, but temperatures have reached 35 degrees outside so I think the excess heat has accelerated water consumption. Fortunately, the upper part of the plants is healthy. I have cut all the lower leaves that are dry or in the process of drying.