When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Krabi is roughly similar to Havana. You can assume this to be the case over the next 6 days.
You can imagine temperatures to be in the 34 °C range in February. The weather in Havana is generally colder than Krabi's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.