Weather: Fill the cup with water. Put shaving cream on top for a cloud. Explain that when clouds get really heavy with water, it rains! Then put blue food coloring on top of the cloud, and watch it rain.
Creating your own rainstorm...this is so cool! All you need is a clear container, water, shaving cream, food coloring and droppers. Have kids make predictions by drawing what they see and think will happen.
Dancing raisins activities. Lots of fun experiments. I have done this experiment, and seen the entire class become silent out of curiosity. It is a great engagement piece for a lesson, and it can be hands on if you ask for volunteers!