Mander: Good timing . 2nd hottest month in Thailand & Malaysia. Keep to the beach as it's sweltering inland. Have flown from USM to HKT (Phuket is close to Langkawi) 6 times or so and have found Samui a little cooler. Monsoon starts up late June usually. May begins 'dry season' in Bali. Don't forget the 30 SPF ! wj