This is an easy question to answer:

Spain's requirement for passport validity after date of departure is 90 days. Don't play guessing games regarding about what airline gate agents might do regarding passport validity enforcement. That's silly. Given that Spain's requirements for passport validity won't work with your passport's August expiration, renew your passport first.

If you're curious, find out what India's and Qatar's requirements are. It won't matter with a newly renewed passport but it might be interesting to know.