The coffee (Coffea arabica L.) genotypes Colombia, Caturra, and Hibrido de Timor, and bean (Phaseolus vulgaris L.) and maize (Zea mays L.) plants were exposed to three temperatures (15°C, 25°C and 35°C), and net photosynthetic rates (PN) and CO2 compensation concentrations (CO2) were measured. PN in coffee leaves was similar for the three genotypes at 15 °C [5,0 . 5,3 µmol(CO2) m-2s-1] and 35 °C [4,9 . 5,5 µmol(CO2) m-2s-1], but lower at 25 °C [5,4 . 11,7 µmol(CO2) m-2s-1]. CO2 increased with temperature in coffee and bean, while in maize no effect was observed. PN and CO2 values documented in coffee genotypes were typical for C3 plants.