Key Summary- Somalia’s climate is overwhelmingly hot desert (BWh) and hot semi-arid (BSh) , with a narrow tropical savanna (Aw) zone hugging the far southern interior.
- Seasonal rainfall is driven by the migrating monsoon trough, bringing two brief rainy periods to the south while the north remains parched for most of the year.
- Geography exerts a powerful influence: the rain shadow of the Ethiopian Highlands, the warm Indian Ocean boundary, and the country’s latitude combine to create a stark coastal‑inland aridity divide.
Somalia sits astride the equator, yet its climate is far from the lush tropical picture that latitude might suggest. WeatherBox’s Köppen climate map reveals a landscape ruled by aridity, with hot desert (BWh) blanketing the northern coast and the Horn’s tip, and hot semi-arid (BSh) stretching across the interior plateaus and much of the central coastal plain. The exception is a pocket of tropical savanna (Aw) near the Juba and Shabelle river valleys in the south, where two monsoon surges briefly coax green life from the ground. This pattern emerges from the seasonal reversal of winds; from December to March, a dry northeastern flow brings dust-laden air from the Arabian Peninsula, while a moist southwest monsoon from the Indian Ocean delivers the country’s precious rains between May and October. The Ethiopian Highlands block deep moisture from reaching inland regions, reinforcing the rain shadow that keeps most of Somalia stubbornly dry.
Regional contrasts in Somalia are sharp and closely tied to the monsoon rhythm. The south experiences a bimodal rainfall pattern, with the main Gu rains (April to June) and the shorter Deyr rains (October to November). Even here annual totals typically reach only 500–600 mm (20–24 in), and their arrival is notoriously unreliable. Along the coast, warm ocean water elevates humidity, so daytime highs of 30–34°C (86–93°F) feel sultry and oppressive. Inland, the heated plains regularly push temperatures above 40°C (104°F) during the dry Jilal season, while the northern Cal Madow highlands capture slightly enhanced rainfall, a modest exception visible on WeatherBox’s precipitation charts. Outside these fragments, the northeast and much of the interior receive less than 200 mm (8 in) annually. That bare rainfall budget, combined with intense sunshine and scorching winds, cements Somalia’s status as one of Africa’s most challenging climatic zones.
