The plague of hail lesson from Exodus 9:13-35 could be combined with the lesson on the rain and the Water Cycle.
The Egyptians and people in the land were told to gather all of their animals and servants and take cover. Hail was going to fall all over the land. Some people listened to God’s warnings; others did not.
Moses was told to raise his hand toward the sky. Then the hail started to fall all over the land of Egypt. There was hail and lightning. It was the worst hailstorm in Egypt since it had become a nation. The hail destroyed all the people and animals that were in the fields (verse 25).
Combine this lesson with a theme on the Water Cycle. Talk about precipitation forming in the clouds then falling/raining down and puddling on the ground then the sun heats up the water and causes evaporation back up into the clouds again.
Fill the science table with water and provide small watering cans for students to scoop and pour water.
For a science experiment about rain, fill a small clear cup with warm water. Cover with plastic wrap. Place the cup outside on the sidewalk on a cool day. Leave the cup outside for about 30 minutes, just enough time for condensation to form on the inside of the plastic wrap on the top of the cup. Bring the cup inside and look at the water droplets/bubbles on the inside of the plastic wrap across the top of the cup. Gently tap the top of the plastic wrap to make the water droplets drop down into the cup, symbolizing rain falling down.
Talk about precipitation as being either rain, sleet, snow, or hail. Talk about how each one of those forms of precipitation occurs.
Do a sequencing activity with pictures of precipitation falling down onto the roof, going down the drain pipe, puddle forming on the ground, sun coming out brightly, then clouds forming again.
Sing: Water! Water cycle! That’s rain! Water! Water cycle! That’s rain! 
First there is a cloud and it rains, it rains. It really, really rains.
The rain fills up the oceans, the oceans. It really fills the oceans.
Water vapor floats up, it floats up. It really, really floats up.
Water forms in the clouds. Water forms in the clouds. It really forms a cloud.
And it rains, it rains. It really, really rains.