amateur observing - Brightest star of the night sky

Sirius is the brightest "star" in the night sky, but not the brightest object in the sky in the early morning, at the time of writing.

In autumn of 2015, Venus is a very bright in the early morning sky, and it outshines any star by several magnitudes of brightness. It is, perhaps, in comparison to Venus that you find that Sirius is "of very average brightness"
On the night you mention, Venus would have appeared as a bright "star" near to the crescent moon, and visible even after sunrise. No other star or planet would have been visible after sunrise.

Compared to the other stars, Sirius is exceptionally bright. However, at this time of the year it is close to the horizon (as seen from Delhi) which diminishes its apparent magnitude. Sirius will also appear to "twinkle" much more than Venus, and as of the time of writing, Venus will appear as clearly a "half disc" in a small telescope.

Learn to follow the sky, with either a map, or stellarium so you can recognise the patterns made by the stars of the sky, then you can find a particular star, such as Sirius, much more easily and confidently.