Temperature of any medium or object falls when it loses the heat. After the heavy shower, water absorbs heat from the surrounding air. Water has high specific heat capacity (i.e. the quantity of heat required by unit mass for the unit rise of temperature) so water absorbs large amount heat from the surrounding without much rise in it's own temperature. Hence, temperature falls.
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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