Check out this forcast. It's not large but definately overhead and good every day. Certain spots will easily be double overhead most of the days. http://www.swellinfo.com/surf-forecast/costa-rica-north.html
I just got back and it was absolutely incredible. Already trying to figure out when i can get back there. Pura vida boys.
http://www.swellinfo.com/surf-forecast/popoyo-nicaragua.html Even better. Has offshores 95% of the time. Never got junky when I was there last summer. I stayed in Playa Grande for 2 weeks a couple of years ago, every afternoon it crapped out.