It is permissible to
combine the Maghrib and `Isha' Prayers during rainfall, which can wet the clothes if one must go out to the Masjid or create mud that may prevent people from going out to the Masjid for fear of getting stuck in it. As you offered Salah at home because there were no neighbors to join you in offering Salah outside home, it would have been better not to combine both Salahs, as there was no difficulty involved and to be on the safe side. However, you do not have to make up for the Salahs you offered, for some scholars maintain that it is permissible to combine Salahs if there is a Shar`y (Islamically lawful) excuse that permits such act for those who should offer Salah at the Masjid.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.