There is nothing in Islam to suggest that it is not allowed to get married during the month of Ramadaan because it is Ramadaan, or in any other month. Rather marriage is permitted on any day of the year.
But the one who is fasting in Ramadaan must refrain from eating, drinking and intercourse from dawn until sun set. So if he can control himself and there is no fear of him doing something that will break his fast, there is nothing wrong with him getting married in Ramadaan.
It seems that those who want to start married life in Ramadaan usually cannot be patient and keep away from their new wives throughout the day, and there is the fear that they may do something that is forbidden and they may fall into grave sin, for which it is obligatory to make up that day’s fast and offer a severe expiation, which is freeing a slave; if that is not possible then they must fast for two consecutive months; if that is not possible then they must feed sixty poor persons. If intercourse happens repeatedly on a number of days, then this expiation must also be repeated for the same number.
Our advice to this questioner is that if there is the fear that he may not be able to control himself, he should delay his marriage until just after Ramadaan, and he should keep himself busy during Ramadaan, with worship, reading Qur’aan, praying qiyaam, and other acts of worship.
And Allaah knows best.