We arrive at the same time as you and don't put too much store by the weather forecasts.
For example, last year we went to Ocho Rios and the weather forecast showned the thunderstorm symbol for our entire stay (7 days). It rained only once for around five minutes on one of the days. The result - everyone who wasn't in the hot tub got in.
If it does rain, it typically doesn't last long.