Out here in the California high desert my plants suffer from the heat as well despite religious watering. I have Willaette, Tettnanger, Cascade, Fuggle, and Hallertauer. If you use containers outside in a hot climate/full sun, make sure they aren't the black plastic ones like nurseries use. I had problems doing that with other plants, not just hops. Four of my plants are in the ground and they still just get too hot in the summer. I need to relocate them to a place that gets at least partial afternoon shade.