Koh Samui

Dec–Feb (Dry/high season): Sunny, low humidity and calm seas—ideal beach and diving weather. Peak prices and crowds, especially around Christmas–New Year. Mar–Apr (Hot/shoulder): Very hot with occasional short storms; still great for beach days. Fewer crowds after New Year. Songkran (Thai New Year, mid‑April) brings lively local celebrations. May–Aug (Shoulder): Warm with intermittent showers and choppier seas. Good value, quieter resorts, and decent diving conditions on calmer days. Sep–Nov (Wet/low season): The rainiest period, especially Oct–Nov—frequent heavy showers and rougher seas. Lowest prices and most closures. Events: Samui Regatta often runs around Sep/Oct and Loy Krathong floats in November. Choose Dec–Apr for guaranteed sunshine; May–Aug for bargains; Sep–Nov only if you don’t mind wet weather and want the lowest rates.