In summer season, after rain why is it the heat so unbearable?
Actually, during rain, the rain water which falls on the earth , gets heat from it and converted into water vapor which remains suspended in the air so that the humidity level increases and so, the sweat is not being evaporated and our body could not be able to cool as earlier and so we feel the heat as unbearable, and also the water vapor traps the temperature and heat energy with itself so the temperature is little increased,too.
The way desert coolers works on dry and hot air in summer , rain also do the same to air.
Air can hold a specific amount water in form of vapours( gas) at a particular temperature. So when its raining, it completly saturate the thrust of dry air, now air is completely satisfied. Temperature is in control for a short time but as it's summer, sun will shine again and here starts the problem. Your body trying to sweat which is nothing but loosing water to air , but air says “ no thank you, I am saturated already”. Your body says “ please take my water”, but air again says “ no way!”. Now your body is loosing it's temper “ you have to take my water or I will fight”. Air : - oh you better try that!!!?
Now starts the problem ,the moment you body try to put extra effort in sweating, that causes a feeling of discomfort.
Funny thing is this discomfort is also temporary , because sun is heating the air too and at higher temperature air can hold more moisture now air won't deny any drink opportunity.