Portugal in last 2 weeks of September. Hows the nightlife

Hello!

me and my friend [m26] are planning to go to portugal for the last week of September.

We’ll arrive in Lisbon then go to Lagos and finish our trip in Madeira. We heard September is a good time to go because its less busy and the weather is more comfortable.

The only thing is we were worried about nightlife during that period since its less busy and we’re planning to go out to party in Lisbon and Lagos.

Will the vibe be more chill or will there still be a lot of people to interact with?

Thank you in advance for any feedback on our itinerary or advice on the nightlife.