October is generally Sri Lanka's wettest month. Whether it is erroneously referred to as the start of the north-east monsoon, or more accurately an inter-monsoon period that can bring thunderstorms across the island, the whole country can experience widespread rain. Particularly avoid Colombo, the west coast from Colombo to Galle and Kandy.
For holidaymakers who find tropical rain uplifting – and you do exist - that means that cut-price deals abound, although travel can be disrupted and not all entertainment facilities will be open.
There are other attractions too. Mannar and Uda Walawe are good for migrating birds in October and Wilpattu game park also has much to commend it. With the best weather likely to be found in the cultural triangle, it is always possible to knit together an attractive itinerary.