Shaykh Abdul-Muhsin al-Abbaad was asked:
Is it allowed for the one who is living in the lands of disbelief, and he is an Imam, to pray the rain prayer when there is a need? This is for the Muslims who are residents [there].
“It is allowed for him to do that”.
[Sharh Sunan Tirmidhi no. 78]
Faisal Ibn Abdul Qaadir Ibn Hassan