Dangerous Late-Summer Heat Wave Triggers Extreme Heat Watch Across Las Vegas and Southern Nevada

LAS VEGAS, NV — The National Weather Service (NWS) in Las Vegas has issued an Extreme Heat Watch spanning Clark, southern Nye, and surrounding tri-state desert counties, as a high-pressure thermal ridge builds across the Mojave Desert.

The multi-day heat event will bring dangerously hot conditions across Southern Nevada, with afternoon temperatures projected to climb between 103°F and 107°F across the Las Vegas Valley and soar up to 115°F to 118°F along Death Valley and the lower Colorado River corridor.

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|          SOUTHERN NEVADA EXTREME HEAT DOSSIER          |
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|  - Issuing Agency: National Weather Service Las Vegas  |
|  - Alert Level: Extreme Heat Watch / Warning           |
|  - Active Window: 10:00 AM Tuesday to 8:00 PM Friday   |
|  - Las Vegas Valley Highs: 103°F to 107°F              |
|  - Overnight Lows: 83°F to 88°F (Little Thermal Relief)|
|  - Colorado River Corridors: 110°F to 118°F (Laughlin, |
|                              Lake Havasu, Bullhead)    |
|  - High-Risk Zones: Death Valley, Lake Mead, Moapa     |
|  - Late-Week Outlook: Monsoonal Moisture & Thunderstorms|
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Thermal Ridge and Elevated Overnight Lows

According to NWS meteorologists, broad mid-level ridging over the Southwest is driving a sharp warming trend, pushing regional temperatures 5 to 8 degrees above seasonal averages.

Widespread Major HeatRisk (Level 3 of 4) is forecast to envelop urban Clark County, exacerbated by overnight low temperatures remaining trapped in the mid-to-upper 80s. The lack of nighttime cooling significantly increases the cumulative risk of heat exhaustion and heat stroke for outdoor workers, unhoused residents, and individuals without access to reliable air conditioning.

“Hot weather will build through midweek before a potential uptick in monsoonal moisture returns late in the week,” noted Cody Moore, meteorologist with the National Weather Service in Las Vegas. “With overnight lows failing to provide relief, residents and visitors must treat heat safety as a priority.”

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|            HEAT SAFETY PRECAUTION CHECKLIST            |
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|  • Hydration: Increase fluid intake; avoid excess      |
|               caffeine and alcohol                     |
|  • Peak Sun Hours: Limit strenuous outdoor activity    |
|                    between 10:00 AM and 6:00 PM        |
|  • Vehicle Safety: Never leave children or pets inside |
|                    parked cars (reaches 140°F in mins) |
|  • Vulnerable Checks: Regularly monitor elderly family |
|                       members and outdoor workers      |
|  • Emergency Action: Heat stroke is a medical crisis;  |
|                      call 911 immediately             |
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Regional Cooling Stations and Late-Week Monsoon Transition

Clark County and the City of Las Vegas have placed regional daytime cooling centers on standby across community centers and public libraries. Southern Nevada health officials remind the public that vehicle cabin interiors can reach lethal temperatures in less than ten minutes under direct desert sun.

Long-range atmospheric models indicate that the thermal dome will begin shifting eastward by late Thursday into Friday, opening a moisture corridor that could trigger isolated monsoonal thunderstorms and localized flash flooding across Southern Nevada heading into the weekend.

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