Hi Karthick, Near Bangalore/Chennai, Coorg, Coonoor, Munnar, Hampi, Yelagiri and Yercaud are some of the places you can visit in Sep end or Oct first week. You can also visit Pondicherry, Mahabalipuram, thanjavur from Chennai. For Hill stations near Bangalore go through the following article
Chennai is situated in the southern state of Tamil Nadu. The friendly locals and culture of this place allures thousands of trippers every year. It is a perfect vacation spot for thrill seekers and beach bums. Being one of the best cities in India, it has many picturesque attractions like Marina Beach, Parthasarathy Temple, Arignar Anna Zoological Park, Government Museum, and San Thome Basilica.
For hotels in Chennai-