halocline
Contributor
Most of the rentals I've seen in Coz are shorties, so I would not count on being able to rent a full suit. January is a strange month weather-wise down there; I've seen water temps above 80, as well as air temps a little on the chilly side. It's impossible to say how you'll feel; I would be okay in a shorty, but would eventually want a full suit as the week went on unless the water temps were unusually high. In the summer-fall I always use a shorty in Coz. Don's suggestion of a beanie is a good one; despite the goofy look, they really help. Staying warm during the surface intervals will also help.