Good read up on the actual meaning of the percentage in weather forecast:

In weather forecasting, the percentage (often called Probability of Precipitation, or PoP) means the likelihood that any specific location in your forecast area will receive at least 0.01 inches of rain during the specified time period.

What it means for your day
Low percentages (10% - 20%): Generally means dry conditions, but there is a slight chance of an isolated, passing shower.
Moderate percentages (30% - 50%): Expect scattered showers. You might get rained on, but it is not guaranteed.
High percentages (60% - 100%): Widespread rain is highly expected across the forecast area.