Expected rainfall in Krabi is more than in Bandar Seri Begawan. You can expect 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 Bandar Seri Begawan 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.