Waiting until October for the Monsoon to stop is a bad idea because between now and then, the water in that cave is sure to rise and possibly flood the area where the boys are now.
They need a better plan than just waiting for the Monsoon to end in October.
I was thinking about that myself. No telling how heavy a particular storm might get or how long it would last or exactly how it might affect conditions in that cave. I imagine few if any people have had experience in there during the Monsoon.