How do forests help in bringing rain?

they use transpiration !

Explanation:

it has something to do with the leaves and their stomata... it makes the air get saturated faster after the process, and that brings in rain!! I hope this helped :D

Transpiration and evaporation

Explanation:

The trees help in bringing rain in an indirect way through the process called transpiration. Through transpiration, trees leave the extra water through the stomata on the leaf surfaces. The water evaporates into the air and adds to the moisture of the air. So the air gets saturated faster and brings rain.

Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor. As a result, rain is bought by transpiration and evaporation.

Hope this helps :)