He was asked—may Allah have mercy on him:
“Regarding combining Maghrib and Isha because of rain: is it permissible because of severe cold or strong winds, or is it permissible only because of rain?”
He replied:
Praise be to Allah, Lord of all worlds. It is permissible to combine Maghrib and Isha because of rain, strong cold winds, or deep mud. This is the sounder of the two scholarly opinions and is the apparent position of the schools of Ahmad, Mālik, and others. And Allah knows best.
He was asked—may Allah have mercy on him:
“A man leads a congregation in prayer. After rain and snow had fallen, he was about to lead them in Maghrib when they said to him, ‘Combine the prayers.’ He replied, ‘I will not.’ May the members of the congregation pray in their homes or not?”
He replied:
Praise be to Allah. Yes, it is permissible to combine prayers because of deep mud, strong cold winds on a dark night, and similar conditions, even if the rain is not