Colombo in September

December through March gives you the dry season with temperatures around 27-30°C. This is peak tourist season, so guesthouses charge more and Galle Face Green gets crowded with families. July and August bring the southwest monsoon, but it's not the city-stopping rain you'd expect. Afternoon showers clear the air and cool things down. Hotel prices drop 30-40% and you'll have temples mostly to yourself. Avoid April through June – it's hot, humid, and miserable. May hits 35°C with crushing humidity. September through November brings unpredictable weather, but also the best fruit season. Mangoes and rambutans are everywhere and cheap.