Here is a list of lovely spots to travel to in September.
Lachen
Kalimpong
Lonavala
Bundi
Jaisalmer
Saputara
Srinagar
Varanasi
Ooty and Kodai
Wayanad
Gokarna
Goa.
And you are from where, like mostly all the places in India are comfortable enough to visit in September. And you also have good amount of time so there are many destinations you can choose from.
1. Jaipur-Ajmer-Pushkar-Jodhpur
2. Jaipur-Jodhpur-Jaisalmer
3. Delhi-Lucknow- Banaras
4. Sikkim
5. Mumbai-Goa-Lonavala
6. Gwalior- Orchha
7. Bangalore-Mysore-Hampi
8. Kashmir