The purpose of this study is to examine the temperature and salinity variability of the İzmir Bay based on available in-situ measurements between 1996 and 2013 in summer. The analyses were made for the whole Bay and also for the sub-basins of the İzmir Bay namely; inner and outer. The similarities and differences were tried to be revealed. The main finding of the study is that there is a strong increase of temperature during the last 10 years. After 2003, it is very interesting that the temperature increase almost 2°C in all two basins. This trend is greater than global warming which is almost 0.5°C. Although the salinity has decreasing trend in all the subbasins, there is an anomaly in 2007. The salinity increases in this year. The impact of such warming and the anomaly in the salinity on the İzmir Bay needs more investigation.