The best time to travel to Sri Lanka depends on your interests and travel style. Generally, the months from December to March offer the best weather for beach and coastal activities, with little rainfall and warm temperatures. For adventure and wildlife activities, the months from April to September, when there is more rainfall, offer more opportunities for exploration.
For cultural and historical activities, any time of year is suitable, although some temples and pilgrimage sites may be more crowded during religious holidays. Ultimately, the best time to travel to Sri Lanka is when the weather and conditions align with your travel plans and preferences.