A 20% chance of rain means that there is a 20% chance that it will rain at some point during the day. Overcast skies mean that the sky is covered with clouds, which can block out the sun and make it feel darker and cooler outside. The combination of a 20% chance of rain and overcast skies means that there is a good chance that it will rain at some point during the day, but it is not guaranteed. If you are planning to be outside, it is a good idea to bring an umbrella or raincoat just in case.

Here are some additional factors that can affect the likelihood of rain:

- **The time of year:** Rain is more likely in the spring and summer than in the fall and winter.
- **The location:** Rain is more likely in some parts of the country than others. For example, the Pacific Northwest is known for its rainy weather.
- **The weather forecast:** The weather forecast can give you a more accurate idea of the likelihood of rain.

It is important to note that the weather is unpredictable, and even if there is only a 20% chance of rain, it is still possible that it will rain. If you are planning to be outside, it is always a good idea to be prepared for the possibility of rain.
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