It is a common misconception that changes in temperature will affect the dewpoint. It is important to remember that dewpoint is independent of the ambient temperature. Only changes in pressure or the actual amount of water vapour present will affect the dewpoint.

How does temperature affect dew?

The higher the dew point temperature, the greater the amount of water vapor is present (source for clouds). The smaller the difference between the temperature and the dew point temperature, the higher the relative humidity (the closer the atmosphere is to a state in which water vapor would condense).

Does dew point change throughout the day?

Meteorologists use the dew point to measure how much water vapor is present in the atmosphere. ... Let`s assume the dew point will not change much throughout the day, as often is the case. In the mornings, when temperatures are usually at their lowest, the air temperature and the dew point will be close together.