Key Summary- Mali transitions from the rainless hot desert (BWh) of the Sahara in the north to the semi-arid hot semi-arid (BSh) Sahel and a pocket of tropical savanna (Aw) in the south.
- Extreme heat dominates countrywide, with the desert interior regularly seeing daytime highs above 40°C (104°F) and high humidity arriving only with the brief southern wet season.
- Rainfall is a seasonal, unreliable visitor controlled by the northward push of the West African Monsoon, bringing almost all annual precipitation between June and September.
Mali’s climate is a story of latitude and the shifting influence of two great atmospheric features: the dry harmattan winds of the Sahara and the moisture-laden flow of the West African Monsoon. Our Köppen climate classification map for Mali reveals a sharp north-to-south gradient. The northern two-thirds of the country fall under hot desert (BWh), where rainfall is negligible and heat is relentless. A central corridor is classed as hot semi-arid (BSh), receiving just enough seasonal rain to support sparse grasslands and scattered agriculture. Only the southernmost fringe, adjacent to Guinea and Côte d’Ivoire, qualifies as tropical savanna (Aw), where a distinct dry season still dominates most of the year but a true wet season arrives with dependable rains. At WeatherBox, our climate charts capture how this entire pattern pulses with the annual movement of the Intertropical Convergence Zone.
In the hot desert north, towns like Tessalit experience a climate of extremes: scorching afternoons, cool winter nights, and dusty harmattan skies between November and March. The dry season here is eternal; the region may go years without meaningful rain. Central Mali, including the Niger River bend around Mopti, sits in the hot semi-arid zone, where peak temperatures still push well past 40°C (104°F) but a short window of monsoon rainfall, typically from July to September, brings a brief greening. Humidity spikes, yet total annual rainfall usually stays below 600 mm (24 inches) and can vary hugely from year to year. The tropical savanna south, around Sikasso, sees a longer wet season from May to October, with totals often exceeding 1,200 mm (47 inches). Here, high humidity and lush vegetation contrast sharply with the arid north, though even the south endures a pronounced dry winter when the harmattan can send dust across the sky. Throughout Mali, temperatures remain stubbornly high, and on WeatherBox you can explore how the interplay of desert, Sahel, and monsoon defines each month’s conditions.
