Chennai is located on the thermal equator and is also Coastal, which prevents extreme temperatures change seasonally. For most of the year the climate is hot and humid. The hottest part of the year is late May and early June, known locally as Agni Nakshatram ( "star fire"), or as Kathiri Veyyil, with maximum temperatures around 38-42 ° C (100 -- -- 107 ° F). The coolest of the year is January, with minimum temperatures around 19-20 ° C (66-68 ° F). The lowest temperature recorded was 15.8 ° C (60.44 ° F) and 45 ° C higher (113 ° F). The average annual rainfall is about 1300 mm (51 inches). The city gets most of its seasonal rainfall from the north-east monsoon winds from mid-September to mid-December. Cyclones in the Bay of Bengal, sometimes hit the city. Highest is registered 2570 mm of rainfall per year (101 in 2005). Prevailing winds in most of Chennai are Southwesterly between May and September, and Northeasterly during the remainder of the year.

Chennai, a coastal city in the Bay of Bengal, is tropical climateChennai is divided into four sections: Northern, Central, South and West. North Chennai is mainly an industrial area. Central Chennai is the heart of the city and includes an important business district, Parry's Corner. Chennai south of Chennai and West, once primarily residential, are becoming commercial, home to a growing number of information technology companies, financial companies and call centres. The city is growing rapidly Mahabalipuram along the Old South Road and the Grand Trunk Road (GST Road) in the south and Ambattur, Koyambedu and Sriperumbdur in west.Chennai is one of the few cities in the world that is a park National, Guindy National Park, within its limits. Chennai is mostly clay soil, shale and sandstone. Sandy areas are located along the river banks and coastlines, such as Tiruvanmiyur, Adyar, Kottivakkam, Santhome, George Town, Tondiarpet and the rest of coastal Chennai. Here, the stormwater runoff quickly percolates through the soil. Clay underlies most of the city, including T. Nagar, West Mambalam, Anna Nagar, Perambur and Virugambakkam. Areas include hard rock Guindy, Velachery, Adambakkam and part of Saidapet.

Chennai city is governed by the Corporation of Chennai, composed of 155 advisers representing 155 districts, and are directly elected by the residents of the city. Among them, councillors elect a mayor and deputy mayor who will preside over about six standing committees. Chennai, the state capital of Tamil Nadu, houses of the state of siege of executive and legislative powers mainly in the Secretariat buildings on campus Fort St George, but also in many other buildings scattered around the city . The Madras High Court, whose jurisdiction extends beyond Tamil Nadu and Pondicherry, is the highest judicial authority of the state and is also in the city. Chennai has three parliamentary constituencies Northwest Chennai, Chennai Central and South-Chennai and elects 18 members of the Legislative Assembly (MLA) to the state legislature. Chennai city police carThe Chennai metropolitan area covers many suburbs that are part of the districts of Kanchipuram and Thiruvallur. Large suburbs are governed by the city, municipalities and the smaller ones are governed by municipal councils known as panchayats. While the city has an area of 174 sq km (67 mi ²), the metropolitan area covers 1189 square kilometres (458 sq. mi). The Chennai Metropolitan Development Authority (CMDA) has developed a second master plan which aims to develop satellite townships around the city. Contiguë Mahabalipuram include satellite towns in the south, Chengalpattu and Maraimalai Nagar, south-west and the city of Kanchipuram, Sriperumpudur, Tiruvallur and Arakkonam to the west.