North Africa spans a dramatic range of climates, from humid Mediterranean coastlines to the hottest, driest desert on Earth. The region covers roughly the top third of the African continent, including Morocco, Algeria, Tunisia, Libya, and Egypt, and its climate is shaped primarily by three forces: the Sahara Desert, the Atlas Mountains, and proximity to the Mediterranean Sea and Atlantic Ocean.
The Mediterranean Coast
The northern edge of the region, stretching from Morocco’s Atlantic coast through Tunisia and into Libya’s Cyrenaica, enjoys a classic Mediterranean climate. Summers are hot and dry, with temperatures typically reaching the mid-80s to mid-90s °F (30–35 °C). Winters are mild and wet, with daytime highs around 60–65 °F (15–18 °C) and most of the year’s rainfall concentrated between October and March. Coastal cities like Algiers, Tunis, and Casablanca receive roughly 15 to 25 inches of rain per year, enough to support agriculture, forests, and relatively green landscapes.
This strip of habitable, temperate land is narrow. In some places it extends only 50 to 100 miles inland before conditions shift sharply toward arid steppe and then full desert. The vast majority of North Africa’s population lives within this coastal belt.
The Atlas Mountains and Rain Shadow
The Atlas range runs through Morocco, Algeria, and into Tunisia, and it acts as a wall between the moist coastal zone and the Sahara. Westerly winds from the Atlantic carry moisture inland, but the mountains block it. The windward (northern) slopes receive heavy rainfall and even snow at the highest elevations during winter. The leeward (southern) slopes are dramatically drier, creating one of the sharpest climate transitions on the planet.
This rain shadow effect is the primary reason the interior dries out so abruptly. Peaks in Morocco’s High Atlas exceed 13,000 feet and are among the few places in Africa that see regular winter snowfall. Temperatures at these elevations frequently drop below freezing, a stark contrast to the desert just a few dozen miles to the south.
The Sahara: Extremes of Heat and Cold
The Sahara Desert dominates the climate story of North Africa. It covers most of the region’s landmass, stretching across roughly 3.6 million square miles, and its climate is defined by extremes.
Summer daytime temperatures routinely reach 104 °F (40 °C), and highs of 122 °F (50 °C) are not unusual in late spring and early summer. But the desert cools dramatically after sunset. In winter months (December through February), daytime averages hover around 68 °F (20 °C) while nights drop to around 41 °F (5 °C). At higher elevations within the Sahara, nighttime temperatures dip to 32 °F (0 °C) and below. The daily temperature swing can exceed 50 °F in a single 24-hour period, one of the largest diurnal ranges found anywhere on Earth.
Rainfall in the central Sahara is almost nonexistent. Some areas go years without measurable precipitation. The southern fringe of the desert, where it meets the Sahel, receives slightly more rain and supports sparse grassland and scrub, but conditions remain harsh and unpredictable.
Hot Desert Winds
North Africa is known for seasonal wind events that can transform conditions almost overnight. The sirocco (known as the khamsin in Egypt and the sharav in the eastern Mediterranean) is a hot, dry wind that blows northward out of the Sahara, most commonly in spring and early autumn. These winds carry sand and dust, can reduce visibility to near zero, and raise temperatures by 15–20 °F in a single day. Humidity during these events often drops below 30 percent.
These wind episodes typically last one to three days and are physically taxing. They alter the body’s hormone and mineral balance, and populations living in exposed areas have long recognized them as a distinct seasonal hardship. Dust from these events regularly reaches southern Europe and can even cross the Atlantic.
The Nile Valley and Egypt’s Climate
Egypt’s climate is almost entirely desert, but the Nile River creates a narrow corridor of humidity and slightly moderated temperatures. Cairo, on the southern edge of the Nile Delta, sees summer highs around 95 °F (35 °C) and winter highs near 66 °F (19 °C), with very little rain at any time of year. Alexandria, on the Mediterranean coast, is cooler and wetter, receiving about 7 inches of rain annually. South of Cairo, rainfall drops to virtually zero. Luxor and Aswan are among the driest inhabited places on Earth.
How Climate Is Shifting
North Africa is warming at a rate higher than the global average. Climate models project a clear temperature increase continuing throughout this century, with the most severe consequences concentrated in water supply. Underground aquifers beneath the Sahara, which provide water to both the Mediterranean coast and the Sahel, are being drawn down. The semiarid strip along the interior margins of the Atlas Mountains is drying further, accelerating desertification in areas that currently support farming and grazing.
Coastal cities face a separate threat from rising sea levels. Heavily populated areas like the Nile Delta and the Tunisian coast are among the most vulnerable in the world, both economically and ecologically. The combination of hotter temperatures, less rainfall, and shrinking aquifers is expected to put increasing pressure on agriculture and water access across the region in the coming decades.