In order to study the influence of thermal radiation and wind environment on the performance of air-cooled proton exchange membrane fuel cell (PEMFC), this paper focuses on the air-cooled PEMFC composed of 20 single cells. The anemometer and radiation heat flow meter are used to measure the wind speed and thermal radiation intensity respectively. The K-type thermocouple and electronic load are used to measure the stack temperature, load current and output power. The experimental results show that, with simultaneous application of thermal radiation and headwind，the average stack temperature increases. The temperature rise of the single cell closest to the radiation source is the largest, while the single cell closer to the middle of the stack has the smaller temperature rise. The increase of the average stack temperature has a good positive correlation with the load current, the thermal radiation intensity and the headwind speed. The output power of the stack increases under low load current, and a good positive correlation is found between the load current and the thermal radiation intensity. Under high load current, when the temperature of the single cell in the middle of the stack exceeds the operating threshold temperature, the stack fails to be operated normally. With simultaneous application of thermal radiation and downwind，the stack temperature increases. As the downwind speed increases, the temperature of the single cell increases more evenly, but the increase rate of the average stack temperature decreases. The output power of the stack is always attenuated. When the stack runs at high load current, enhancing the heat dissipation capacity of the stack cannot effectively improve the output power of the stack, and therefore the water management inside the stack should be involved.