How Hot Is Death Valley? Inside Earth's Hottest Spot

Death Valley is hot enough, often enough, that it holds the World Meteorological Organization's official recognition for the hottest reliably measured air temperature on Earth: 134°F at Furnace Creek on July 10, 1913. That single record is almost beside the point. What actually defines Death Valley is a normal summer, when Furnace Creek averages a daily high near 116°F in July and routinely tops 120°F for days at a stretch. A basin floor that drops below sea level, mountains on every side, and desert air with almost nothing in it to hold moisture combine to make this one of the very few places on the planet where triple-digit heat is simply the weather, not the exception.

How hot does Death Valley get?

At Furnace Creek, the main visitor hub and long-running weather station inside Death Valley National Park, the average daily high in July is close to 116°F, based on NOAA's 1991-2020 climate normals. June and August run only slightly cooler, and the park typically logs multiple days each summer at 125°F or hotter. That is a monthly average, not a ceiling. Individual days regularly exceed it, and the gap between an ordinary hot afternoon and a genuinely dangerous one can be smaller than visitors expect.

It is worth separating a few different numbers that all get called "the temperature." Standard air temperature, the figure reported by the National Weather Service and used for records, is measured a few feet above the ground inside a shaded, ventilated instrument shelter. Ground temperature at Death Valley's lowest, barest points can run 40 to 50°F hotter than the air temperature on the same afternoon, since bare desert soil and rock absorb and re-radiate solar heat far more efficiently than shaded air does.

A dashboard or car interior in direct sun can climb past 150°F within minutes even on a moderately hot day, and any "feels like" or heat index figure accounts for humidity, which is usually low enough in Death Valley's dry air that the feels-like number tracks close to the actual air temperature rather than amplifying it the way humid heat does.

Why is Death Valley so hot?

Death Valley is hot because several factors stack on top of each other, not because of any one cause working alone. The valley floor sits well below sea level, reaching 282 feet below sea level at Badwater Basin, which means the air column above it is thicker and heavier than at higher elevations, and thicker air compresses and warms more as it sinks. Steep mountain ranges wall the valley in on both sides, the Panamint Range to the west and the Amargosa Range to the east, and those slopes do two things: they block cooling ocean air from reaching the valley floor, and they let hot air that rises off the desert during the day sink back down and recompress at night, recycling heat instead of letting it escape.

Add to that Death Valley's extremely dry air and sparse vegetation. Moist air and plant cover both act like a buffer against extreme heat, since evaporating water absorbs energy that would otherwise go into raising the air temperature. Death Valley gets under two inches of rain in an average year, among the driest spots in North America, so there is almost no moisture to soften the heat and very little plant cover to shade the ground or cool the air through transpiration. Clear skies are the norm here, which means nearly unobstructed sunlight reaches the desert floor on most summer days, and at this latitude summer days are long, giving the sun more hours to heat the basin before nightfall.

What is the verified temperature record?

The officially recognized record is 134°F, measured at the Greenland Ranch weather station in Death Valley on July 10, 1913, and it stands today as the World Meteorological Organization's accepted record for the hottest reliably measured air temperature on Earth. Greenland Ranch was a cooperative observer station, not a modern automated network site, and the observation predates today's standardized instrument shelters and siting practices by decades. That historical gap has led some meteorologists and climate historians to question whether 1913-era conditions and equipment could have produced an artificially inflated reading, even as the figure remains the official record on the books.

The scrutiny is not unique to Death Valley. In 2012, a WMO evaluation committee disqualified a long-standing claimed record of 136.4°F from El Azizia, Libya, in 1922, after finding problems with the instrument and observation conditions at that site. That same investigation left the Death Valley 1913 reading in place as the official record, which is why credible modern sources describe it as the verified record while still noting the historical debate around it, rather than treating it as either beyond question or discredited. In the decades since 1913, Death Valley's Furnace Creek station, the modern successor to Greenland Ranch, has recorded some of the hottest reliably confirmed modern readings on Earth, including temperatures at or above 130°F in more recent summers, using today's standardized instruments.

How hot are Death Valley nights?

Nighttime in Death Valley rarely delivers real relief. Furnace Creek's average overnight low in July sits near 88 to 90°F, based on NOAA's 1991-2020 climate normals, and during the most intense heat waves overnight lows have stayed above 100°F. That is a meaningful difference from most hot places, where even a scorching day is usually followed by a night cool enough for the body to recover. The same mountain-ringed basin that traps heat during the day keeps radiating it back after sunset, since the surrounding slopes limit how quickly warm air near the ground can drain out and be replaced by cooler air.

High overnight lows matter for visitor safety more than they might seem to on paper. Prolonged heat exposure without a break to cool down raises the risk of heat exhaustion and heat stroke, which is part of why health guidance from the National Weather Service's heat safety program emphasizes cooling off during the coolest part of the day, typically overnight and early morning, as a core heat-safety strategy. In Death Valley during peak summer, that strategy has a much smaller window to work with than it does almost anywhere else in the country. For a deeper look at how heat builds and lingers across Southern California more broadly, see what causes a heat wave, which covers the high-pressure systems behind the region's hottest stretches.

When is a summer visit most dangerous?

Midday and early afternoon, roughly 11 a.m. to 5 p.m., are the most dangerous hours to be active outdoors in Death Valley during summer. Air temperature peaks in this window, and ground-surface temperatures on bare desert soil can run 40 to 50°F hotter than the air above them, which is part of why the National Park Service closes or strongly discourages several strenuous, low-elevation trails during the hottest months and posts heat warnings at trailheads and visitor centers.

Vehicle breakdowns are the single hazard park rangers point to most often for summer visitors, and the reasoning is straightforward. Much of Death Valley National Park is remote, with long distances between services, spotty to nonexistent cell coverage away from a handful of developed areas, and pavement and dirt roads that can put a stranded traveler far from help. A routine mechanical problem that would be a minor inconvenience almost anywhere else becomes a life-threatening situation here if a vehicle overheats or breaks down miles from the nearest help in 120°F heat. The National Park Service's own visitor guidance treats vehicle readiness as a safety issue on par with carrying enough water, not a separate travel-logistics concern.

How should visitors plan around extreme heat?

Plan around the clock, not just the calendar. Visit in early morning or evening rather than midday whenever possible, since the temperature swing across a single summer day in Death Valley is large enough to change a hike from pleasant to dangerous within a few hours. The National Park Service recommends carrying at least one gallon of water per person per day, more for anyone hiking or exerting themselves, and treats this as a minimum rather than a suggestion given how quickly dehydration progresses in such dry, hot conditions.

Vehicle preparation deserves the same weight as hydration. Start any trip with a full tank of fuel, good tires, and a mechanically sound vehicle, and stay on paved roads rather than remote dirt routes where a breakdown is harder to reach. Keep the engine running and air conditioning on if the vehicle is capable of handling it; contrary to older advice about shutting systems off to prevent overheating, the National Park Service's current guidance is that a parked vehicle in full summer sun becomes dangerous inside within minutes without active cooling. Set a firm turnaround time before starting any hike or drive into the backcountry, and treat that time as non-negotiable rather than something to push past if the destination is close.

Before entering the park during hot weather, check the current Furnace Creek point forecast and any active National Park Service alerts, since conditions and road status can change with little notice. The same extreme-heat mechanics that make Death Valley an outlier also show up, in far milder form, across nearby desert communities like Palm Springs, which sits in its own lower-elevation desert basin and regularly posts some of the hottest readings in the broader Los Angeles weather region even though it never approaches Death Valley's numbers.

If you are trying to understand why a coastal or inland Los Angeles heat wave feels the way it does by comparison, from Downtown Los Angeles to Woodland Hills and Pasadena, the mechanism is related but the scale is not close. For the physiological side of extreme heat, including why humidity changes how dangerous a given temperature actually is, see what is wet-bulb temperature.

Death Valley earns its reputation honestly. It is not a place where a single record from 1913 does all the work; it is a place where an ordinary summer afternoon routinely reaches temperatures that would make headlines almost anywhere else on the planet, driven by a below-sea-level basin, mountains that trap and recycle heat, and air too dry to soften any of it. That combination rewards respect rather than bravado.

Before a summer trip to Furnace Creek, check the current forecast, confirm your vehicle is ready for the drive, and pack more water than you think you will need. If you are weighing a Death Valley trip against a cooler Southern California escape, WeatherEscape's Los Angeles destination pages let you compare current conditions across the region before you decide where to go.