Colombo Ratmalana International Airport lies in the tropics at 6.82° N, 79.89° E, on Asia/Colombo time (UTC+5:30). Tropical airports contend with heat and humidity, both of which thin the air and lengthen takeoff runs, and with convective storms that build fast in the afternoon.
Colombo Ratmalana International Airport has 1 runway. The longest, 04/22, measures 6,013 ft by 100 ft, which puts the field in the regional category: regional jets and turboprops are the natural fit. The surface is asphalt. It is lit for night operations.
Runway 04/22 is aligned roughly north-east/south-west, which is the clearest hint you get about the prevailing wind here: runways are built to face the wind that blows most often, because aircraft take off and land into it. Every runway here shares that north-east/south-west alignment, so a strong crosswind means a crosswind landing rather than a switch to another strip.