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Being an island, Sri Lanka is blessed with a diverse topography which has managed to attract many visitors from around the world. The highlands of Sri Lanka are located in the centre of the Southern part of the island. The main highlands consist of a range of topographical features including peaks, plateaus, valleys, basins, escarpments, ridges etc. The rest of the island is quite flat except for the small hills that are found scattered around. These features strongly affect the temperature, seasonal rainfall, wind patterns and humidity of the island which is quite prominent during the monsoon season.
Rainfall in Sri Lanka consists of Monsoonal, convectional and expressional while the monsoons play a major role in the share of the annual rainfall. The mean annual rainfall is less than 900mm in the South-eastern and north-western (driest) parts of the island to over 5000mm in the western slopes and the central highlands.
Due to its location in the equatorial and tropical zones, Sri Lanka has been influenced by the monsoons which consist of four very distinctive seasons.
First Inter-monsoon Season (March – April) – Thunderstorm type rainfall with warm and uncomfortable conditions
Southwest-Monsoon Season (May – September) – The warm season is eased away by the windy weather during this particular monsoon season. Rains can be expected during any time of the day
Second Inter-monsoon Season (October – November) – Rains occur with thunder storms while the influence of the weather system like depression and cyclones in the Bay of Bengal is considered to be common. The whole island experiences wide spread rain with strong winds
Northeast-Monsoon Season (December – February) – Cold and dry windy weather can be expected during this season while cloud free and days filled with sunshine can be expected. Rain can be expected in several parts of the island as well.