We have been to Panama in January everytime. We have been there as Early as the 7th January and last year we went the last week of January. I can honestly say I think I have seen 10drops of rain only. It has gotten cloudy but has cleared up just as fast. I would not be concerned about rain down there. That is why I keep returning. Have been in the Dominican and Mexico in January and have had rain every time. To try and get an idea on the weather, I go to Accu Weather and go to the page for international weather then put in Farallon, Panama. It will then give you 2 choices, pick Coccle(I Think) and that will give you the fishing village next to the Decameron. You can also type in Pennome, the town 20minutes away.
We have done the Emberra Village, well worth the time. It is about a 2 hour bus ride, then you get into a large dugout canoe. You first go to a little falls with a fresh water pool. You can swim there. Very refreshing on a hot day as the water is cool, coming from a spring. You are then brought to their village, very unique . They feed you lunch, put on a show and offer crafts for sale. Some women are topless (their tradition) so don;t be surprised. You are leaving this Monday so enjoy yourself and don’t worry about the weather. Any other questions, just ask. Have a great trip.