This document summarizes a study that measured the temperatures inside nests of the Australian water dragon (Physignathus lesueurii) over several days in November and December. The study found: 1) Nest temperatures remained relatively constant, between 23-29°C, even as external temperatures varied more widely. 2) The highest nest temperatures were recorded on a sunny day in early December, while overcast days saw maximums below 25°C. 3) Nest temperatures were generally lower than those reported for similar sized tropical lizards, remaining cooler than external temperatures to prevent overheating of eggs.