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The dew point is the temperature at which the air can no longer hold all the water vapor (humidity) present.
Warm air can hold a lot more water vapor than cold air.
That's why most fog "burns off" by late morning. It really doesn't burn off, but as the air becomes warmer, it is able to absorb the water vapor.
That's also why - barring a weather front moving through - the (relative) humidity is always higher in the morning, goes down throughout the day, and then rises after the sun goes down. Relative humidity is a function of air temperature and the amount of water vapor present.
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