National Weather Service Escalates Heat Advisory as Dangerous 105°F–110°F Temperatures Grip Las Vegas Valley

LAS VEGAS, NV — The National Weather Service (NWS) in Las Vegas has issued an escalated heat advisory across Southern Nevada, warning residents and tourists of Major to Extreme Heat Risk as an intense late-summer high-pressure system pushes daytime highs between 105°F and 110°F across the Las Vegas Valley through the upcoming weekend.

The prolonged excessive heat event brings elevated risks of heat-related illness due to minimal overnight relief, with overnight low temperatures struggling to dip below the upper 80s and low 90s in urban core sectors.

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|          SOUTHERN NEVADA HEAT ADVISORY DOSSIER         |
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|  - Issuing Agency: National Weather Service Las Vegas  |
|  - Threat Level: Major to Extreme HeatRisk (Level 3-4) |
|  - Peak Temperatures (Las Vegas Valley): 105°F – 110°F |
|  - Lower Colorado River Valley: 110°F – 114°F          |
|  - Death Valley National Park: 115°F – 120°F+          |
|  - Overnight Lows (Urban Core): 85°F – 90°F            |
|  - Event Duration: Tuesday, Aug. 25 through Saturday   |
|  - Heat-Related Fatalities (Clark County 2026): 46+    |
|  - Public Safety Action: Extended Cooling Stations Open|
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Multi-Day Thermal Ridge Over the Mojave Basin

Meteorologists report that a strong subtropical ridge centered over the Desert Southwest is trapping intense solar radiation and suppressing cloud cover. The resulting atmospheric compression is driving daytime temperatures 4 to 8 degrees above seasonal late-August averages.

In low-elevation desert corridors south and east of the valley—including Laughlin, Bullhead City, and Lake Havasu City—temperatures will regularly surpass 112°F, while Death Valley National Park is forecast to reach up to 118°F.

Within the Las Vegas metropolitan bowl, the urban heat island effect will compound daytime conditions by radiating stored thermal energy from asphalt and concrete back into neighborhoods overnight.

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|             DAY-BY-DAY VALLEY TEMPERATURE OUTLOOK      |
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|  • Tuesday: High 106°F | Overnight Low 86°F            |
|  • Wednesday: High 108°F | Overnight Low 87°F          |
|  • Thursday (Peak): High 109°F | Overnight Low 89°F    |
|  • Friday (Peak): High 110°F | Overnight Low 89°F      |
|  • Saturday: High 107°F | Overnight Low 86°F           |
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Health Advisories and Emergency Cooling Infrastructure

The Southern Nevada Health District (SNHD) and the Clark County Office of Emergency Management have coordinated extended operational hours across municipal daytime cooling stations, community recreation centers, and public libraries.

Health officials noted that extreme heat has already contributed to at least 46 confirmed heat-related fatalities across Clark County this year, with vulnerable unhoused populations, outdoor construction workers, and the elderly facing the highest risk.

“Major HeatRisk indicates a level of heat that affects anyone without effective cooling or adequate hydration,” the National Weather Service stated in its regional bulletin. “Never leave children or pets unattended in vehicles, as interior temperatures can reach lethal levels within minutes.”

First responders urge the public to limit strenuous outdoor activity to early morning hours, drink copious amounts of water before feeling thirsty, and recognize early symptoms of heat exhaustion, including dizziness, heavy sweating, nausea, and muscle cramping.

Source: National Weather Service Las Vegas Weather Forecast Office, Southern Nevada Health District, Clark County Office of Emergency Management.