A 20% chance of rain means that there is a 20% probability of precipitation occurring in your area. It's a relatively low chance, but it's still possible that it could rain. Overcast weather refers to a cloudy sky where there is little or no direct sunlight. While overcast weather doesn't necessarily mean that it will rain, it can create a damp and cool atmosphere. If you're planning to go for a walk, you might want to bring a light jacket or umbrella just in case.
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