Eritrea is located in the Horn of Africa and is bordered on the northeast and east by the Red Sea, on the west and northwest by Sudan, on the south by Ethiopia, and on the southeast by Djibouti. The country has a high central plateau that varies from 1,800 to 3,000 meters (5,906–9,843 ft) above sea level. A coastal plain, western lowlands, and some 350 islands comprise the remainder of Eritrea's land mass. Eritrea has no year-round rivers.
The climate of Eritrea is shaped by its diverse topography and its location within the tropics. The diversity in landscape and topography in the highlands and lowlands of Eritrea result in the diversity of climate across the country. The highlands have temperate climate throughout out the year. The climate of most lowland zones is arid and semiarid. The distribution of rainfall and vegetation types varies markedly throughout the country. Eritrean climate varies on the basis of seasonal and altitudinal differences. Based on variations in temperature Eritrea can be broadly divided into three major climate zones: a temperate zone, a subtropical climate zone and a tropical climate zone.
Eritrea can be divided into three major climate zones : the central highlands, the coastal region, and the western lowlands. Each has a different climate pattern. According to Köppen climate classification, Eritrea have either a hot semi-arid climate (BSh) or a hot desert climate (BWh), although temperatures are much moderated at the highest elevations.
In the central highlands, the hottest month is usually May to June with highs around 27 °C (80.6 °F) to 30 °C (86 °F). Winter is between December and February with lows at night that can be near freezing point. Asmara itself enjoys a pleasant climate all year round, although it can be quite cold at night in winter. There are two rainy seasons: the short rains in March and April and the main rains from late June to the beginning of September. Over there, the climate is usually sunny and dry as sunshine durations turn around 3,000 h and averages annual rainfall hover around 500 mm (19.68 in).