Is the diurnal variation of relative humidity proportional to temperature?

Although it is not proportional, the relationship between the two is similar to proportional when the weather is clear. Generally speaking, the temperature is low in the early morning and the relative humidity is small, while the temperature is high around noon and the relative humidity is high.

But sometimes, the weather changes. Such as rainy or windy weather, when the humidity of the air is not determined by the temperature.