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Extreme Heat Warning Covers Lake Havasu, Las Vegas Valley and Death Valley as Highs Near 118 Degrees

The National Weather Service warning record for Las Vegas NV puts 16 zones in northwest Arizona, southeast California and southern Nevada — including Lake Havasu and Fort Mohave, Lake Mead on the AZ side and Death Valley National Park — under an Extreme Heat Warning from 10 AM Tuesday through 8 PM Friday.

4 reports on this incident · first at Aug 17, 2026, 5:54 a.m. ET

By AI ReporterUpdated Aug 17, 2026, 10:57 a.m. ET
Developing · checked 25h ago

Hazard products are revised and cancelled as conditions change. Check the National Weather Service for the current alert before acting on this report.

We last searched for new coverage of this at Aug 17, 2026, 8:11 a.m. ET — checked 25h ago.

An is in force for Lake Havasu and Fort Mohave, Lake Mead on the AZ side, the Las Vegas Valley and Death Valley National Park, according to the official record issued by the on August 18, 2026. The record sets the period from 10 AM PDT / MST Tuesday to 8 PM PDT / MST Friday, and covers zones across The record describes dangerously hot conditions, with temperatures up to 115 to 118 degrees expected through Death Valley and the lower Colorado River Valley, and highs between 107 to 110 degrees elsewhere. Zones named in the record include Lake Havasu and Fort Mohave; Lake Mead, AZ side; Lake Mohave, AZ side; the Hualapai Mountains; the Northwest Deserts; Death Valley National Park; the Eastern Mojave Desert; the Morongo Basin; the Cadiz Basin; San Bernardino County; the Upper Colorado River Valley; Northeast Clark County; Western Clark and Southern Nye County; the Las Vegas Valley; Southern Clark County; and Lake Mead and Lake Mohave on the NV side. Cities listed in the record include Lake Havasu City, Wikieup, Henderson, Mesquite, Boulder City, Golden Valley, Mountain Pass, Temple Bar, North Las Vegas, Baker, Hualapai Peak, Valentine, Moapa, South Cove, Needles, Pahrump, Bullhead City, Cal-Nev-Ari, Indian Springs, Vidal Junction, Las Vegas, Amargosa Valley, Furnace Creek, Hoover Dam and Dolan Springs. On impacts, the record states that The precautions in the record advise drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking up on relatives and neighbors. It says not to leave young children and pets in unattended vehicles, because car interiors will reach lethal temperatures in a matter of minutes. It also advises wearing lightweight and loose-fitting clothing, limiting strenuous activities to early morning or evening, and taking action at the first symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the record notes that the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency, the record states: call 9 1 1. Residents are advised to monitor the latest forecasts and warnings for updates.

Earlier reports

  1. Aug 17, 2026, 6:20 a.m. ET

    National Weather Service Extends Extreme Heat Warning Through Friday

    An Extreme Heat Warning issued by the National Weather Service Las Vegas NV will now run longer than first issued, extending through 8 PM PDT / MST Friday. The warning, which begins at 10 AM PDT / MST Tuesday, August 18, 2026, covers 16 zones across portions of northwest Arizona, southeast California, and southern Nevada.

    Official records report dangerously hot conditions, with temperatures up to 115 to 118 degrees expected through Death Valley and the lower Colorado River Valley, and highs between 107 to 110 degrees elsewhere. Affected areas include Las Vegas, Henderson, North Las Vegas, Bullhead City, Lake Havasu City, Needles, Pahrump, and Furnace Creek. Heat-related illnesses increase significantly during extreme heat events, according to official records.

    Precautions listed in the warning advise drinking plenty of fluids, staying in air-conditioned rooms, staying out of the sun, and checking on relatives and neighbors. The Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments during outdoor work. Anyone overcome by heat should be moved to a cool and shaded location, and for heat stroke emergencies, Call 9 1 1.

  2. Aug 17, 2026, 6:14 a.m. ET

    Extreme Heat Warning Issued for Portions of Nevada, Arizona, and California

    The alert level for portions of northwest Arizona, southeast California, and southern Nevada has been raised to an Extreme Heat Warning, according to official records from the National Weather Service Las Vegas NV. The warning begins at 10 AM on Tuesday, August 18, 2026, and expires at 8 PM on Friday, August 21, 2026.

    National Weather Service records state that dangerously hot conditions are expected across 16 zones, with temperatures up to 115 to 118 degrees expected through Death Valley and the lower Colorado River Valley, and highs between 107 to 110 degrees elsewhere. Cities under the warning include Las Vegas, Henderson, North Las Vegas, Boulder City, Pahrump, Bullhead City, Lake Havasu City, Needles, and Furnace Creek.

    Official records warn that heat-related illnesses increase significantly during extreme heat events. The weather service advises people to drink plenty of fluids, stay in air-conditioned rooms, stay out of the sun, check up on relatives and neighbors, and avoid leaving young children and pets in unattended vehicles, where car interiors can reach lethal temperatures in a matter of minutes.

  3. Aug 17, 2026, 5:54 a.m. ETFirst report

    Extreme Heat Warning Takes Effect Tuesday Morning for Southern Nevada, Northwest Arizona and Southeast California

    An Extreme Heat Warning has been issued in advance for parts of three states and does not begin until 10 AM PDT / MST Tuesday, August 18, 2026. According to the Extreme Heat Warning product issued by the National Weather Service Las Vegas NV, the warning will remain in force until 8 PM PDT / MST Friday, August 21, 2026. The record lists the timing as "From 10 AM PDT / MST Tuesday to 8 PM PDT / MST Friday."

    Until Tuesday morning, the warning is not yet active. The office issued it ahead of the event so that residents and employers have time to prepare.

    When it does begin, the warning covers portions of northwest Arizona, southeast California, and southern Nevada — 16 zones in all. The record states that dangerously hot conditions with temperatures up to 115 to 118 degrees are expected through Death Valley and the lower Colorado River Valley, with highs between 107 to 110 degrees elsewhere.

    The zones named in the record are Lake Havasu and Fort Mohave; Lake Mead, AZ side; Lake Mohave, AZ side; the Hualapai Mountains; the Northwest Deserts; Death Valley National Park; the Eastern Mojave Desert; the Morongo Basin; the Cadiz Basin; San Bernardino County; the Upper Colorado River Valley; Northeast Clark County; Western Clark and Southern Nye County; the Las Vegas Valley; Southern Clark County; and Lake Mead and Lake Mohave, NV side.

    Communities inside those zones include Las Vegas, Henderson, North Las Vegas, Boulder City, Mesquite, Indian Springs, Pahrump, Amargosa Valley, Cal-Nev-Ari, Moapa, Temple Bar, South Cove, Hoover Dam, Dolan Springs, Golden Valley, Valentine, Wikieup, Hualapai Peak, Bullhead City, Lake Havasu City, Needles, Vidal Junction, Baker, Mountain Pass and Furnace Creek.

    On the risk to people, the record says plainly: "Heat-related illnesses increase significantly during extreme heat events."

    The National Weather Service advises drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking up on relatives and neighbors. Young children and pets should not be left in unattended vehicles; the record warns that car interiors will reach lethal temperatures in a matter of minutes. Anyone outdoors should take extra precautions, wear lightweight and loose-fitting clothing, and try to limit strenuous activities to early morning or evening.

    To reduce risk during outdoor work, the record notes that the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency, the record says: call 9 1 1. The office also advises monitoring the latest forecasts and warnings for updates, which may change the start time or extent of the warning before Tuesday.

    These details come from the Extreme Heat Warning product issued by the National Weather Service Las Vegas NV, dated 2026-08-18 local, and distributed through NOAA's raw text product feed.

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Revision history

  1. Version 217 Aug 2026, 14:57current

    Headline rewritten to lead with the hazard and the specific areas it covers (Lake Havasu, Las Vegas Valley, Death Valley) rather than the issuing office; issuer moved out of the headline entirely. Dek now names the record and the specific zones. Body expanded to list all 16 zones and all cities exactly as given in the record, with attribution shifted from generic "official records" to the named National Weather Service Las Vegas NV warning record. All figures printed as given: 115 to 118, 107 to 110, 16 zones, 9 1 1, 10 AM PDT / MST Tuesday to 8 PM PDT / MST Friday. No facts added.

  2. Version 117 Aug 2026, 10:20current

    First published.

  3. Version 117 Aug 2026, 09:54current

    First published.

  4. Version 117 Aug 2026, 09:24

    First published.

  5. Version 117 Aug 2026, 10:14current

    First published.

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