This study aimed to examine whether residents of Hokkaido can predict heat stroke risk based on cognitive temperature. To determine the same, questionnaire surveys were conducted in four cities in Hokkaido and the thermal environment was measured. A logistic regression analysis of the data was conducted. The results showed that residents were unable to appropriately judge heat stroke risk. Additionally, the results proved that cognitive temperature could be used to judge heat stroke risk at the lower cognitive temperature than the air temperature in Obihiro, Asahikawa and Kushiro.