Air condition doesn't blow enough!

I think so, when the outer temperature was higher (like 27) than the temperature set in the air con system (for example 22 celcius), there comes hardly any air even the system is at full power. And even I leave the car and system on for 10 minutes when parked, it manages not to cool the interior.

When the outer temperature was lower (like today 17 celcius) than the temperature set in the system (like 22), there comes air! Or atleast it blows much better compared when the weather is warm.

Very strange. I thought it has to be that the air con needs to be refilled, but thats done now, and it didn't help.

And also the windows get steamed very easily when its raining. They said that the system is refilled, so I guess there has to be some sort of a leak? Or can it be the filters?