Internal carbon dioxide, ethylene production, and ripening of mature durians (Durio zibethinus Murray) cv. Chanee were monitored at 24, 27, 30, and 33°C. Typical climacteric patterns were recorded at all test temperatures, but at 33°C very low amounts of ethylene were produced. A rapid reduction in firmness and starch content was associated with an increase in soluble solids, total sugars, and ?-carotene, at all temperatures. Changes in soluble solids, total sugars, and starch content were slower at 27°C; however, ripening occurred at all temperatures.