As Hatay and its surroundings are exposed to intense tectonism, it varies in terms of the landform. Major surface shapes are mountain, plateau and plains. The most important mountainous area is the Amanos Mountains, which rises as a set between the Mediterranean and the graben area in which the Amik plain is located, extending along the northeast-southwest direction. The highest point of these mountains in the city is the Mığır Hill (2240m) in the west of Hassa.
To the east of the Amanos Mountains, there is a graben area parallel to the extension of the mountains. The base of this graben is Amik Plain. This is the most important and most productive agricultural area of the city. The other important plains in the city are; İskenderun Plain, Dörtyol Plain, Payas plain, Erzin Plain (are located in the east and north-eastern part of the İskenderun Bay) and the Orontes Delta Plain, where the Orontes river flows into the sea. The Kuseyr Plateau is located in the south of the city between the Orontes River and the Syrian border. Its altitude varies between 400m-900m. The hills and discrete Keldağ (1730m) on the plateau are remarkable.
The Mediterranean climate is dominant in the city; hot and dry in summers, warm and rainy in winters. Annual average temperature in Hatay is between 15 to 20 °C degrees. Monthly temperature averages reach the highest values during the summer months and lowest in winter months.
The average annual rainfall in the city varies between 562.2 to 1216.3 mm. Most precipitation falls during the winter and the least in the summer. Utmost precipitation falls in the winter, and the least in the summer. Another noteworthy feature of the rainfall is that Amanos Mountains to the east of Dörtyol have a steep reach to the air currents coming from the sea and rainfall around 1500mm annually due to the orographic precipitation due to it.