Weather is probably a major factor when you plan your trip to Colombo 05, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April, with an average temperature of 27°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Colombo 05 are May, October, June and November, with each month seeing an average of 401 mm of rainfall.