All plants stop growing when the temperature surpasses a certain point. It's different for each type of plant. Misting can lower the temperature when it’s too hot for growth. When the water evaporates it lowers the surface temperature of the plants. It also can lower the soil temperature. But I would advise against misting for this purpose. This is because water droplets will magnify the sun's rays and result in plant scalding. It also can encourage plant diseases. Instead, let the plants natural defenses against heat take over. This will encourage deep root growth, which is good for your plants.