E xercise plays an important role in maintaining a healthy body. Exercise can also affect metabolism and regulation of body temperature. Environmental factors can have an influence when doing physical activity. Based on several studies that have been conducted, there is a decrease in exercise capacity or VO2 max value in physical exercise carried out at hot temperatures and vice versa. The presence of a physiological response and endurance exercise capacity indicates that ambient temperature can play an important role for exercise performance.METHOD This study used an observational analytic method with cross sectional study to determine whether or not there was a relationship between environmental temperature and the capacity of aerobic physical exercise in high school students. The technique used is non-probability sampling with the type of consecutive sampling. This study uses primary data in the form of environmental temperature and a 6-minute walking test for students in SMA Negeri 2 Kota Tangerang. The number of samples is calculated using the t-independent formula, the results of these calculations are 35 samples. The processing and analysis of research data was carried out using the SPSS (Statistical Package for Social Science) computer program with paired T-test with a significance level of 0,05.RESULTSThis study was obtained from 35 subjects, from the aerobic exercise test carried out at hot temperatures the results of the average distance traveled were 396.14 m while in the cold temperature aerobic exercise test the average distance traveled was 430.87 m. Based on the paired T-test showed a significant influence between the ambient temperature and the capacity of aerobic exercise with a value of p = 0,000 (p <0.05)CONCLUSIONResearch conducted by researchers found that the capacity of aerobic physical exercise at cold temperatures was higher than the capacity of aerobic physical exercise at hot temperatures.