Indicates you're accepting what someone has said as true, often with a hint of resignation. He said it would rain today, and right enough, I see clouds gathering.
Pro Tip 2/3
Mild Agreement
Shows you somewhat agree but it may also imply that you're not fully convinced. You reckon it's the best film this year? Right enough, it has good scenes.
Pro Tip 3/3
Colloquial Confirmation
It's a casual way of confirming something, not usually used in formal contexts. The game was quite challenging. Right enough, we did need extra practice.