Roubaix is a temperate oceanic climate: while summer experiences mild temperatures, winter's temperatures may fall to below zero. The current city's name is most likely derived from two Frankish words: "raus" meaning reed and "baki" meaning brook.Lastly, one can cite Rosbacum as the definite Latin transcription of Roubaix which has been in use since the 19th century, as recorded on dedication statements sealed in the first stones of the foundations of the City Hall laid in 1840 and the Church of Notre Dame laid in 1842. Landscape with the castle, surrounded by a moat, next to the Sainte-Elisabeth hospital at left, the mill at right and the Saint-Martin church, regarded as the city's centre point, at centre.Together with the nearby cities of Lille, Tourcoing, Villeneuve-d'Ascq and eighty-six other communes, To a greater extent, Roubaix belongs to a vast conurbation formed with the Belgian cities of Mouscron, Kortrijk and Tournai, which gave birth to the first European Grouping of Territorial Cooperation in January 2008, Lille–Kortrijk–Tournai with an aggregate over 2 million inhabitants.
The existence of this south boundary remained until the 18th century and marked an urban expansion which mainly occurred on the western and northern sides of the town.
Increasing industrialisation, land transport improvement, continued population growth and the resulting need for suitable low cost lands for housing and manufacturing plants, all of which finally led to expand the city southward from the centre, in the 19th century. Since then, this number has fallen to two with Roubaix 1 and Roubaix 2.
Within this background Roubaix has brought together two Buddhist traditions on its territory, hence cultural variations across communities: Mahāyāna and Theravāda with, respectively, one and four places of worship.
During the Middle Age, the city grew in a northward-facing semicircle around its primitive core, beyond the area spread out between the church Saint Martin and the former fortified castle.
Belgian settlement was a feature of the Roubaisian life at that time.
whereas in the remaining period of this century its population doubled.As of August 2013 there were six mosques in the town, including one under construction.According to estimates by the mayor's office, around 20,000 people, or about 20 percent of the population were Muslims.As regards towns' boundaries, Roubaix is encompassed by seven cities which constitute its immediate neighbouring environment.These municipalities are namely: Tourcoing to the north and the northwest, Wattrelos to the northeast, Leers to the east, Lys-lez-Lannoy to the southeast, Hem to the south and Croix to the southwest and the west.After the last redistricting of French legislative constituencies in 2010, the city is now divided into two constituencies : Nord's 7th constituency which include the former canton of Roubaix-Ouest and Nord's 8th constituency formed by the following former cantons: Roubaix-Centre, Roubaix-Nord and Roubaix-Est.