Rain Cloud in a Jar Weather Experiment for Kids

May 28, 2026

Rain clouds start out quietly.

A little water.
A soft white cloud.
A few drops of color.

But then the cloud begins to change.

The clouds begin to grow heavier.
The colors spread.

The “rain” starts slipping through the cloud and falling into the jar below.

Kids aren’t just watching it rain from a window.
They’re seeing it happen and HOW rain forms right in front of them.

Child using droppers to create colorful rain clouds in a jar during a weather science experiment for kids

This rain cloud in a jar experiment is one of our favorite weather science activities for kids because it turns a big science concept into something visual, colorful, and hands-on. It’s quick to set up, visually dramatic, and easy to adapt for different ages.


Even better, you can create classic blue rain, rainbow rain, or glowing storm clouds depending on the experience you want to create.


Child watching blue rain fall through a shaving cream cloud during a rain cloud in a jar experiment


This activity is perfect for:

  • weather units
  • preschool science
  • STEM learning
  • science fair projects
  • rainy day play
  • sensory science activities

If your kids love visually dramatic science, they may also love our glowing storm jar activity and this colorful oil and water experiment for kids.  For even more fun science be sure to check out our science activities hub.

Rain Cloud in a Jar Experiment

Supplies

You only need a few simple materials:

  • Clear jars or glasses
  • Water
  • Shaving cream
  • Food coloring or liquid watercolors
  • Small bowls or cups
  • Pipettes or droppers
  • Paper towels

Optional:

  • Neon or fluorescent colors
  • Blacklight for glowing rain effects
Supplies for a rain cloud in a jar experiment including clear jars of water, shaving cream, blue liquid watercolors, droppers, paper towels, and a blacklight flashlight arranged on a bright tabletop


How to Make Rain Clouds in a Jar

Step 1: Fill the Jar with Water

Fill a clear jar about 2/3 to 3/4 full with water.

Cold water tends to work best because it helps the colored rain move more slowly and visibly through the jar.

Glass jar filled with water beside a blue dropper while creating colorful rain clouds

 

Step 2: Add the Cloud

Carefully add a thick layer of shaving cream to the top of the water.

The shaving cream becomes the “cloud” in this experiment.

Try not to pack it down too tightly. A soft fluffy layer creates the best rain effect.


Two jars topped with shaving cream clouds during a rain cloud in a jar weather science experiment


Step 3: Prepare the Rain

In small bowls or cups, mix water with several drops of food coloring.

You can create:

  • classic blue rain
  • rainbow rain
  • pastel rain
  • neon rain
  • glowing rain under blacklight

Multiple colors make the effect even more exciting because kids can actually watch the “rain” move through the cloud and swirl into the water below.

Bowls of colored water and droppers prepared for a rainbow rain cloud science experiment



Step 4: Make It Rain

Use pipettes or droppers to slowly squeeze the colored water onto the shaving cream cloud.

At first, the cloud absorbs the liquid.

Then the magic starts.

The cloud becomes heavier until the colored rain finally falls through into the jar below.

Kids LOVE this moment.

Child using a pipette to add blue rain to a shaving cream cloud in a jar experiment

Watch the Rain Cloud Form

As more colored water is added, the cloud becomes over-saturated and the rain begins streaming through the jar.

The effect is mesmerizing and surprisingly realistic.

Close-up of rainbow-colored rain streams twisting through water beneath a shaving cream cloud


Rainbow versions are especially fun because the colors twist and blend as they fall.

Rainbow-colored rain falling through a shaving cream cloud inside a jar during a weather science experiment


The Science Behind the Experiment

This activity demonstrates how clouds hold water in the atmosphere.

Just like real clouds, the shaving cream can only hold so much liquid before it becomes too heavy.

Once the cloud reaches that point, the “rain” begins to fall.

This makes the experiment a fantastic visual introduction to:

  • weather systems
  • clouds
  • precipitation
  • the water cycle
  • saturation

Because kids can actually SEE the process happening, the concept becomes much easier to understand.

If your kids enjoy science they can actually watch and explore, our rainbow density jar experiment is another fun way to explore colorful liquid science at home.

Tips for the Best Results

  • Use plenty of shaving cream for dramatic rain effects.
  • Let the shaving cream settle for a minute before adding color.
  • Insert the pipette slightly into the cloud to help it fill faster.
  • Add colors slowly for the prettiest swirling rain patterns.
  • Try neon liquid watercolors under blacklight for glowing storm clouds.

Extend the Play

One of the best parts about this experiment is how easy it is to change the results.

Try experimenting with:

  • warm water vs cold water
  • fewer colors vs many colors
  • thick clouds vs thin clouds
  • glow colors under blacklight
  • larger jars or vases

You can even compare how the “rain” behaves in different containers.

Kids naturally begin making predictions, testing ideas, and observing changes as they play.

What Makes This Different

There are lots of weather experiments for kids.

But this one works especially well because it combines:

  • visual science
  • sensory play
  • movement
  • color
  • hands-on learning

The cloud slowly changing and finally overflowing creates a dramatic payoff kids genuinely remember.

And because the setup is simple, it’s easy to repeat again and again.

Collage of kids creating rain clouds in jars with colorful rain and shaving cream clouds during a weather science activity


More Weather & Science Activities Kids Love

If your kids enjoyed this activity, try these next:



Final Thoughts

Rain clouds in a jar are one of those science activities that never seem to lose their magic.

Kids love watching the clouds fill.
They love predicting when the rain will fall.
And they especially love seeing all the swirling color inside the jar.

Simple to set up.
Beautiful to watch.
And packed with hands-on science learning.

This is definitely one weather experiment worth repeating.


Rain cloud in a jar science experiment for kids showing blue food coloring dripping through fluffy shaving cream clouds into clear water in a glass jar

Save This Rainy Day Science Activity for Later! 📌

Growing a Jeweled Rose

Growing A Jeweled Rose

Growing a Jeweled Rose is a site packed with fun and educational activities for kids. Read more about us or catch up with our favorite posts.

More About the Author

Crystal Underwood is the writer and creator of Growing A Jeweled Rose. She has worked extensively with children and strongly believes in the importance of play at the core of early learning. She is passionate about the early years and believes that childhood should be a truly magical time in life. For all the best kids activities connect with Growing a Jeweled Rose below!


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