Question

why do forest attract rain?

Answer 1

They don't attract rainfall, but they cause rainfall. Trees/plants with green leaves expel water vapors, and larger mass of them leads to the accumulation of water vapors in the area. It rains after condensation.

Answer 2

Answer:

In equatorial climates, forests maintain higher evaporation rates than other cover types, including open water. Thus, forests draw in moist air from elsewhere; the larger the forest area, the greater the volumes of moist air drawn in (see figure 1)