Can I combine prayers if it is raining?

Short Answer

No, because there are several conditions required even for the scholars who allow this practice, and they are usually not met by people who live in modern cities with paved roads and cars.

Reason for Asking the Question

There are authentic reports that the Prophet combined prayers in the mosque when it rained.

What the Scholars Said

Hanafi school: not allowed to combine due to rain
Imam an-Nawawi [Shafi’i school]: “It is permitted to combine the prayers in rain, praying them at an early time (i.e. praying the second prayer early), and in the ‘new school’ it is forbidden to pray it in its later time (when combining). The condition for praying it at an early time is that (the rain is) present at the time of the first prayer. The most correct view is that it must be present at the time at the end of the salams. Snow and hail are just like (the ruling of) rain if it is pouring. The evident (and most correct) view is that this concession is for those who are going for prayer in a group at the mosque that is far away and the rain creates difficulty for him in his path.” (Minhaj at-Talibin)

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Shaykh Mustafa Umar