Question

Why does heat become oppressive in summer after rain?

Answer 1

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After the rain, the relative humidity of the atmosphere near the ground is very high. Our ability to overcome heat by perspiring is due to the fact that when evaporating, water takes energy in form of heat and cools down our skin. 

The degree at which water evaporates is, of course, proportional to the relative humidity in the air. For example, in the fog, when the relative humidity is 100 percent and the air said to be at dew point temperature, no evaporation exists and no cooling is felt. 
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