Thermal comfort is a comfort that relates to the room’s temperature conditions such as heat and cold which is manifested from the sensor on the skin and conveyed to the brain. So, the body can adjust the temperature to the surrounding environment. According to the American Standard of ASHRAE 55 of 2009, The purpose of this study is to analyze the suitability of the thermal comfort standard at the At-Taqwa Mosque of the GegerKalong KPAD. The research is conducted by measuring the thermal comfort at the At-Taqwa Mosque. It uses an anemometer measurement tool. The aspects of thermal comfort measured are wind speed, temperature, and relative humidity. The measurement results show that the thermal comfort at the At-Taqwa Mosque is still below the standard. The results of this measurement are simulated on three digital software which are named Sunhour, Flowdesign, and CBE Thermal Comfort. The results of the simulations on these three software show the thermal comfort at the At-Taqwa Mosque doesn’t approve to standard of ASHRAE 55 of 2009 because the highest temperature is on the western exterior area with 33.5 C and the lowest is on the eastern interior area with 23.6 C.