The 24-year-old scored twice for Brazil in their 4-0 victory over Venezuela on Sunday, including a spectacular 30-yard effort.
"He's playing well at the moment, and that was a fantastic strike," Hughes told Manchester City's official website.
"Two goals from that international is a great return for him and I'm sure that when he returns he'll be very buoyant, which he usually is anyway.
"He's very positive, it shows that he's happy with his football and in himself at the moment, which is a big part of what we have been able to give him.
"He's playing week in, week out in front of a crowd that absolutely adores him; you can see the joy in his play and I hope we reap the benefits."
Hughes feels the presence of Robinho's international team-mates Jo and Elano at Eastlands has helped the player to settle.
"The weather's something we don't enjoy either and I have lived here for many, many years," Hughes continued.
"Robinho has settled in very well and it has obviously helped that he has some of his Brazilian friends around him.
"It's so important that when you bring in top players they settle as soon as possible and Robinho has certainly done that."