Cheap flights in August from Porto

So, today I started searching for flights for my summer vacation, but I just found 200€ flights from Porto to the destinations I want. Eindhoven, Pisa, Maastricht, Lille, Brussels, Weeze, Bremen, Dublin, Rome, Bologna, everything is very expensive.

Last year I paid just 100€ for a flight in the end of July. I booked it in May. Should I wait for a prices drop, or should I book the flight now?

Speaking for Brussels (CRL) : prices to Porto never are very cheap. Specially in summer. And the Ryanair fares are on the rise, generally speaking...
At the moment, prices for a Porto-CRL return in July-August are indeed around 200 euros.
It's of course impossible to predict with any certainty if the prices will drop or rise. And trying to give an advice is risky !
But if there are reduced fares for the routes that interest you, they will be offered in May or June. As there are nearly a dozen such routes, there is a good possibility that a few of them will be offered at a lower price.
My advice is that you could wait until May, as you did last year.
But it's only my opinion, not a sure thing !
And in the meantime, have nevertheless a frequent look at the fares.

Ty very much. I'll wait.