I was in San Pedro last week. I chill easily and the only time I wore a sweat shirt was sitting on the Paradise Villas' dock at night (listening to Jerry Jeff Walker sing at Wet Willy's.) One day was cloudy and there was a shower that morning. I was in town and never got cool. The morning that we left started out cloudy and then there was a downpour. The sun came out and except for a puddle here and there, you would never have known that it had rained. I have only been to AC a couple of times, both in February, and we never had a bad day! One of our fishing guides even told us that the weather forecasts on TV there are a day behind! You will have a beautiful time.
I went out to watch the sunrise in shorts and a long sleeve t-shirt. After it was up, the long sleeves were too warm. It is truly summer in San Pedro Town!!!