Krabi has a tropical savanna climate. On the Andaman coast like Phuket, Krabi province has to a six months long rainy season between May and November with heavy rainfalls often brief but regular. On average, it rains less in Krabi than in Phuket.
The best time to come to Krabi is from December to March and especially in January-February. During summer it rains oftent especially from August to the end of October, the worst period to come to Krabi.
See weather forecast in Krabi