The Hottest Places on Earth

Death Valley, California

Death Valley holds the WMO-recognised record for the highest air temperature ever measured at a surface weather station: 56.7°C (134.1°F) at Furnace Creek Ranch on 10 July 1913. The valley sits roughly 86 metres below sea level in the Mojave Desert, and its basin geometry is central to why temperatures reach such extremes. Steep canyon walls absorb solar radiation during the day and radiate it back into the valley at night, while the surrounding mountains prevent any cooling air from reaching the valley floor. There is virtually no vegetation and therefore no evaporative cooling, and the rock and sand surface reflects almost no solar energy back into the atmosphere.

Modern summers in Death Valley routinely produce air temperatures above 50°C. The 1913 record has attracted periodic scrutiny from climatologists who question whether 1913-era instruments were fully calibrated, but it remains the official WMO figure. Ground surface temperatures measured by satellite in the valley have reached over 80°C -- high enough to cause burns on contact.

Kuwait and the Arabian Peninsula

For consistently inhabited extreme heat, nowhere on Earth rivals the Arabian Peninsula. On 21 July 2016, Mitribah in Kuwait recorded 54.0°C (129.2°F), the highest temperature verifiable under modern WMO instrument standards. On the same date, Turbat in Pakistan recorded the same value. Many climatologists consider these readings more reliable than the 1913 Death Valley record because they were made using calibrated modern instruments operating under strict WMO protocols.

The Gulf region's extremity comes from a specific combination of factors. The interior desert heats up rapidly with no moisture or vegetation to absorb solar energy. The shallow, warm waters of the Arabian Gulf increase humidity slightly without providing meaningful cooling, and in summer the atmospheric circulation pattern known as the Persian trough draws in hot air from the surrounding desert. Kuwait City, Baghdad and Basra regularly top 50°C in July. The combination of extreme heat and humidity in coastal areas periodically produces wet-bulb temperatures -- which measure the body's ability to cool through sweating -- that approach the limit of human survivability even with shade and water.

Dallol, Ethiopia

Dallol holds the world record for the highest mean annual temperature: approximately 34.4°C averaged over the period 1960-1966, the only years for which consistent records exist. This is not an extreme maximum -- it is an average, meaning that even the coolest part of the year at Dallol exceeds the peak summer temperatures of most temperate countries. Daily highs regularly reach 45°C and above.

Dallol sits in the Danakil Depression in the Afar Triangle, one of the lowest, hottest and most geologically active places on Earth. The depression reaches approximately 125 metres below sea level, which means the air is denser and retains heat more efficiently. Hydrothermal activity beneath the surface produces acidic hot springs and salt formations -- the landscape is visually extraordinary but almost entirely inhospitable. The town itself was a brief potash mining settlement that was abandoned in 1960. There are no permanent residents.

Dasht-e Lut, Iran

The Dasht-e Lut -- "Desert of Emptiness" -- in south-eastern Iran holds the record for the highest ground surface temperature ever recorded on Earth. NASA and other satellite systems have measured surface skin temperatures of approximately 70°C (158°F) in the central desert, with readings of 66-70°C confirmed in multiple years. This is not an air temperature reading: the dark, bare rock and sand surface absorbs far more solar radiation than the air above it and heats to temperatures no instrument at standard height would detect.

The Dasht-e Lut covers around 51,000 square kilometres of absolute desert. There is no vegetation, no surface water and almost no human presence in the interior. Rain is essentially unknown -- the surrounding mountains trap all moisture before it reaches the basin. In summer the region sits beneath a persistent high-pressure system that suppresses cloud formation and maximises solar input. Air temperatures measured at ground level at the few stations near its edges have recorded above 50°C, and it is widely believed that the interior air temperature, if measured, would rival or exceed any existing world record.

The Saharan Interior

The Sahara is the world's largest hot desert, covering roughly 9 million square kilometres across northern Africa. Its interior -- spanning Algeria, Libya, Niger and Mali -- routinely produces some of the highest air temperatures on Earth, though many of these readings lack full WMO verification due to the remoteness of the stations and infrequent instrument maintenance. Automated stations in central Algeria and Libya have recorded air temperatures approaching 50°C, and ground surface temperatures in excess of 60°C are common across wide areas.

The combination of extreme solar radiation, near-zero humidity, no vegetation cover and very low elevation in the desert basins produces conditions where temperatures above 47°C are ordinary summer events. The towns of In Salah in Algeria and Ghat in Libya are among the most consistently extreme inhabited locations in the Sahara. The desert's northern edge has been repeatedly broken by Saharan air masses pushing into southern Europe during summer blocking events -- an increasingly frequent occurrence as the atmosphere warms.

What Makes a Place Extremely Hot?

Every location on this list shares several characteristics. Latitude plays the most obvious role: locations within 30 degrees of the equator receive far more solar radiation per square metre than higher latitudes, and the sun is overhead for longer. Elevation matters significantly -- lower elevations have denser air that holds heat more effectively, which is why below-sea-level basins like Death Valley and the Danakil Depression consistently produce extreme readings.

Distance from the sea is critical. Maritime air masses carry moisture that absorbs heat and limits temperature rises. Desert interiors far from any ocean can heat freely without this moderation. Vegetation cover -- or the lack of it -- determines how much solar energy is absorbed versus reflected. Bare dark rock and sand absorbs upwards of 85% of incoming solar radiation; vegetation and water reflect much more and release water vapour that cools the air through evaporation.

Finally, atmospheric subsidence -- air descending from the upper atmosphere -- suppresses cloud formation, blocks rainfall and compresses as it falls, warming further. The subtropical high-pressure belt that sits over the world's great hot deserts is not a coincidence: it is precisely the mechanism that keeps them dry, cloud-free and exposed to maximum solar radiation year after year.