Due to the location of Sri Lanka, within the tropics between 5o 55' to 9o 51' North latitude and between 79o 42' to 81o 53' East longitude, the climate of the island could be characterized as tropical.
The central part of the southern half of the island is mountainous with heights more than 2.5 Km. The core regions of the central highlands contain many complex topographical features such as ridges, peaks, plateaus, basins, valleys and escarpments. The remainder of the island is practically flat except for several small hills that rise abruptly in the lowlands. These topographical features strongly affect the spatial patterns of winds, seasonal rainfall, temperature, relative humidity and other climatic elements, particularly during the monsoon season.
The Climate of Sri Lanka is dominated by the above mentioned topographical features of the country and the Southwest and Northeast monsoons regional scale wind regimes. The Climate experienced during 12 months period in Sri Lanka can be characterized in to 4 climate seasons as follows.
1. First Inter-Monsoon Season - March - April
2. Southwest Monsoon Season - May - September
3. Second Inter-Monsoon Season - October - November
4. Northeast Monsoon Season - December - February
Out of the above you do not need to worry at all on Point Nos. 3 & 4 as they are in the Eastern / North Eastern part of the country. Also don’t worry about Point No. 1 as it is only inter Monsoon Rain which is not heavy. What needs to be taken into consideration if at all is Point No. 2. However during this period too it doesn’t rain heavily throughout. Also mostly the raining is in the evenings and therefore tourists need not worry much as by this time they have returned to their respective hotels after completing visits during the day time. Furthermore to be honest, what is mentioned herein are the technically accepted rain patterns that are now mostly changed due to Global Warming as happens all over the world. As a result there is more dry weather that rainy weather throughout the year making Sri Lanka an ideal destination for tourists.
The only condition that prevails on a specific note is, the Ocean’s Waves being Rough (Strong) in the southwestern & southern beaches of the country during April to November and the Eastern & Northeaster beaches from November to April. This situation only prevents tourists being not able to bathe / swim in the ocean on certain days but they could always enjoy relaxing on the beaches.