--- title: "How long can you survive in the Sahara Desert?" description: "Around a day without water in summer daytime heat, and several days if you can stay in shade and move only at night. What actually happens physiologically, in what o" url: https://atoneplace.net/could-you-survive/sahara/ site: "At One Place" --- # How long can you survive in the Sahara Desert? **How long can you survive in the Sahara Desert?: Around a day without water in summer daytime heat, and several days if you can stay in shade and move only at night.** 12-24 hours walking in daytime heat without water; 2-5 days resting in shade Summer afternoon air temperatures in the central Sahara commonly exceed 45 °C, and ground surface temperatures go far higher. A person walking in that loses well over a litre of sweat an hour, so the three-day water figure compresses to something closer to one. Dehydration in heat is self-accelerating: as blood volume drops, the body cannot move heat to the skin, sweating falls off, and core temperature climbs into heat-stroke range above 40 °C. The night is the other half of the story — desert nights lose heat rapidly under a clear dry sky and can drop below 5 °C, so hypothermia is a genuine second risk for someone already depleted. Shade, stillness during the day, and staying with a broken-down vehicle rather than walking away from it are what change the numbers. ## What changes the figure - Shade during daylight can more than halve water loss - Moving at night rather than midday is the single largest difference - Staying with a vehicle makes a person far easier to find from the air > Physiology, not instruction. Every figure here is a population range under particular conditions, and individual variation is large — temperature, exertion, fitness and health move all of them substantially. Nothing on this page is medical advice. ## Places - [How long could you survive in deep space?](https://atoneplace.net/could-you-survive/deep-space/) — About fifteen seconds of consciousness, and roughly ninety seconds before the damage becomes irreversible. - [Could you survive on Mars?](https://atoneplace.net/could-you-survive/mars/) — Unprotected, under two minutes. In a pressurised habitat, indefinitely — the limits become supply and radiation. - [How long can you survive in the death zone on Everest?](https://atoneplace.net/could-you-survive/everest-death-zone/) — Hours to a couple of days. Above about 8,000 metres the body deteriorates no matter what you do. - [How long can you survive adrift in the open ocean?](https://atoneplace.net/could-you-survive/open-ocean/) — In warm water with a raft, three to five days without drinking water — but immersion in cold water is measured in hours. - [How long could you survive on the Moon?](https://atoneplace.net/could-you-survive/the-moon/) — About fifteen seconds of consciousness without a suit. With one, the record stay is 75 hours. - [How long could you survive in the Mariana Trench?](https://atoneplace.net/could-you-survive/mariana-trench/) — Unprotected, no measurable time at all — the pressure is over a thousand times atmospheric. In a submersible, as long as the life support lasts. - [How long can you survive in Antarctica?](https://atoneplace.net/could-you-survive/antarctica/) — Minutes to an hour unprotected in a winter storm — or indefinitely, since around a thousand people overwinter there every year. - [How long could you survive on Venus?](https://atoneplace.net/could-you-survive/venus/) — Seconds. The surface is 465 °C at ninety-two times Earth's atmospheric pressure — the hardest place in the solar system to land on. - [Could you survive on Jupiter?](https://atoneplace.net/could-you-survive/jupiter/) — There is no surface to survive on — you would fall inward until pressure and heat ended it, within minutes. - [How close to the Sun could you survive?](https://atoneplace.net/could-you-survive/the-sun/) — Nothing solid survives contact — but a shielded spacecraft has flown within about 6 million kilometres of the surface. - [How long could you survive on a desert island?](https://atoneplace.net/could-you-survive/desert-island/) — Fresh water decides it. With a spring or reliable rain, years; without, about three days. - [How long can you survive on the International Space Station?](https://atoneplace.net/could-you-survive/the-iss/) — Indefinitely while it is resupplied — it has been continuously crewed since November 2000. - [How long can you survive in the Arctic?](https://atoneplace.net/could-you-survive/the-arctic/) — Hours unprotected in winter — but roughly four million people live above the Arctic Circle permanently. - [How long can you survive in a cave?](https://atoneplace.net/could-you-survive/cave-system/) — With water and warmth, months — people have done it deliberately. Without light or a way out, hypothermia is the clock. ## Common questions ### How long can you survive in the Sahara Desert? Around a day without water in summer daytime heat, and several days if you can stay in shade and move only at night. ### What changes how long? Shade during daylight can more than halve water loss Moving at night rather than midday is the single largest difference Staying with a vehicle makes a person far easier to find from the air ## Related pages - [How long could you survive in deep space?](https://atoneplace.net/could-you-survive/deep-space/) - [Could you survive on Mars?](https://atoneplace.net/could-you-survive/mars/) - [How long can you survive in the death zone on Everest?](https://atoneplace.net/could-you-survive/everest-death-zone/) - [How long can you survive adrift in the open ocean?](https://atoneplace.net/could-you-survive/open-ocean/) - [How long could you survive on the Moon?](https://atoneplace.net/could-you-survive/the-moon/) - [How long could you survive in the Mariana Trench?](https://atoneplace.net/could-you-survive/mariana-trench/) - [How long can you survive in Antarctica?](https://atoneplace.net/could-you-survive/antarctica/) - [How long could you survive on Venus?](https://atoneplace.net/could-you-survive/venus/) - [How long can you survive without water?](https://atoneplace.net/could-you-survive/without-water/) - [How long can you survive without food?](https://atoneplace.net/could-you-survive/without-food/) - [How long can you survive without air?](https://atoneplace.net/could-you-survive/without-air/) - [How long can you survive without sleep?](https://atoneplace.net/could-you-survive/without-sleep/) - [Can you survive being struck by lightning?](https://atoneplace.net/could-you-survive/lightning-strike/) - [How long can you survive in freezing water?](https://atoneplace.net/could-you-survive/freezing-water/) ## Sources - National Oceanic and Atmospheric Administration — NOAA (https://www.noaa.gov/) [Public domain (US Government)]