On a sunny day, you're most likely to see cumulus clouds. They are puffy, white clouds that look like cotton balls and often have flat bottoms.

Here's why:

* Cumulus clouds form when warm, moist air rises. Sunny days provide the warmth needed for this process.

* They are associated with fair weather. While they can sometimes develop into thunderstorms, they typically indicate stable atmospheric conditions.

While cumulus clouds are the most common on a sunny day, you might also see:

* Cirrus clouds: These are thin, wispy clouds that are made of ice crystals. They are often high in the sky and can indicate a change in weather.

* Altocumulus clouds: These are white or gray clouds that are arranged in patches or layers. They are usually found at mid-levels in the atmosphere and can indicate a chance of rain.

It's important to note that weather can change quickly, so even on a sunny day, it's good to be aware of any clouds that are developing.