Galle in May

December through March gives you the best weather — dry, sunny, and not too hot. This is peak season though, so book accommodations well ahead and expect higher prices. January and February are perfect, with temperatures around 28°C and minimal rain. April through November brings the monsoons, but they're not constant downpours. You'll get dramatic afternoon storms followed by clear evenings. Hotel rates drop by 40% and you'll have the fort mostly to yourself. Just pack an umbrella and flexible plans. The waves get bigger during monsoon season, which surfers love but swimmers should avoid.