Hey, Saurabh I'd say Madrid, Barcelona, Seville, and Valencia are the best cities to visit during September/October. If you want to cover something offbeat you can plan for Granada and Malaga as well. The weather is pleasant with a little bit of rain, the average temperature would be around 26 degrees in the daytime and drops to 17 degrees at night. Here is a budget itinerary for 6 days for your reference.
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Hi,Begin your tour on Southern part of Spain’s Costa del Sol by visiting the port city of Malaga, and get a chance to witness city’s two massive hilltop citadels, the Alcazaba and ruined Gibralfaro, remnants of Moorish rule, then head to the capital of southern Spain’s Andalusia region – Seville which is famous for flamenco dancing along with various Moorish style architecture including Gothic Seville cathedral, afterwards, head to Spain’s Central capital – Madrid and enjoy its beautiful and elegant boulevards and expansive, manicured parks such as the Buen Retiro and get indulge yourself into its rich repositories of European art, finally, make your way to the cosmopolitan capital of Spain’s Catalonia region – Barcelona where you can enjoy its mesmerizing architecture designed by Antoni Gaudi along with several Roman archaeological sites.