Sheikh Muhammad al-Qannâs
According to the strongest of the opinions expressed by the scholars, it is permissible to combine between the Zuhr and `Asr prayers or between the Maghrib and `Ishâ’ prayers in one’s city of residence if there is rain enough to make one’s clothes wet and people face difficulty going out to the mosque.
The same ruling applies to conditions like serious flooding, extremely muddy terrain, or gale-force winds.
The evidence for this ruling is the hadîth narrated from Ibn `Abbâs: “Allah’s Messenger (peace be upon him) combined between the Zuhr and `Asr prayers and between the Maghrib and `Ishâ’ prayers in Madinah without there being rain nor fear.” [Sahîh al-Bukhârî (510) and Sahîh Muslim (1151)]
The hadîth indicates by implication that it is permitted to combine between these prayers on account of rain. This is also something that was accepted by the Companions.
Ibn Taymiyah writes about the hadîth of Ibn `Abbâs: “It indicates that prayers are combined on account of fear and rain.”
He also writes: “It is also permitted to combine prayers on account of severely muddy ground conditions and fierce, cold winds on a dark night, and other comparable conditions, even if rain is not coming down at that time. This is according to the most correct of the two views expressed by the scholars.” [Majmû` al-Fatâwâ (24/29)]
And Allah knows best.
Source: Islam Today