There is a Muslim community living in a kaafir land where the rains are late. Is it permissible for them to pray for rain, since if rain comes it will
benefit the kuffaar too?

Praise be to Allaah. 

We asked Shaykh ‘Abd-Allaah ibn ‘Abd
al-Rahmaan al-Jibreen, may Allaah preserve him, and he answered as
follows:

 It is permissible for Muslims to pray
for rain in the land of the kuffaar even if that will benefit the kuffaar
too.