When to Go to the Gulf Coast Beaches
December to March is the best time to visit the Eastern Gulf: the seas are mostly calm and the skies mostly clear. Pattaya and Koh Samet are year-round destinations. Many places in Koh Chang and nearby islands used to close down in the rainy season, but the tourist boom has given the region a year-round tourist trade. The big car ferries continue to run on a limited schedule during the rainy season, and most resorts and hotels stay open and offer cheaper rates.
During the low season, flying to Koh Samui is still convenient, and the island and its neighbors are beautiful even with cloudiness and rain. Cha-Am is busy year-round, as is historic Hua Hin.