Sri Lanka is subject to two monsoons. Then the rainy season starts on the North and East Coast, the dry season starts on the South and West Coast & vise versa. This means Sri Lanka is a year around destination, and there is always a ‘right’ season somewhere in the island.
High Season (Dec–Mar)
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The Hill Country plus west- and south-coast beaches are busiest – and driest.
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The Maha monsoon season (October to January) keeps the East, North and ancient cities wet.
 
Shoulder (Apr & Sep–Nov)
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April and September offer the best odds for good weather countrywide.
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A good time to wander without a set schedule.
 
Low Season (May–Aug)
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The weather in the North and East is best.
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The Yala monsoon season (May to August) brings rain to the south and west coasts plus the Hill Country.