Park goers cool off in the water fountain in Washington Square Park amid a heat wave on July 2, 2026 in New York City.
Extreme heat is moving from the margins of US travel planning into day-to-day operations, complicating airline schedules, forcing national parks to rethink visitor activity and changing how travellers use destinations during the busiest months of the year.
The shift has been difficult to miss in 2026. The West and Southwest recorded their warmest January-to-June period in 132 years of records, according to NOAA's National Centers for Environmental Information. Across the contiguous United States, the average June temperature reached 70.6°F, 2.2°F above the 20th-century average.
For travel businesses, the concern is no longer simply whether a heatwave makes a destination less appealing. At sufficiently high temperatures, aircraft performance changes. Hiking trails become hazardous in the middle of the day. Hotels face heavier cooling loads, guides need to alter itineraries and travellers begin moving activities — or entire trips — to cooler hours and seasons. While Summer remains one of America's biggest travel periods, it is also becoming harder to operate.
Airlines confront the operational cost of heat
Aviation offers one of the clearest examples of how extreme temperatures can translate into commercial disruption. Aircraft generate less lift in hot, less-dense air, while engine performance can also be affected. The Federal Aviation Administration says maximum take-off temperatures vary according to aircraft type, weight, airport elevation and other operating conditions. There is no single temperature at which flying stops; airlines work within limits set for individual aircraft and circumstances.
That distinction matters. A flight does not have to be cancelled for heat to disrupt an airline's operation. Carriers can reduce weight by carrying less fuel or cargo, offloading passengers or delaying departure until temperatures ease. The Associated Press reported in August that those trade-offs are becoming more relevant as intense heat reaches airports across the country.
Las Vegas provided a striking example this summer. On July 24, as temperatures at Harry Reid International Airport reached 114°F, American Airlines sought volunteers willing to give up their seats on a departing flight, AP reported. Desert hubs such as Las Vegas and Phoenix are obvious pressure points, but the industry's exposure is broader. Airports at higher elevations or with shorter runways can encounter performance constraints at lower temperatures. Research cited by AP suggests weight restrictions could eventually affect 10% to 30% of flights at some airports by mid-century.
For airlines, the implications run through network planning and revenue management as much as flight operations. Taking passengers or cargo off an aircraft carries a cost. So does delaying a departure, disrupting connections or moving operations into cooler parts of the day. Heat is becoming another summer irregular-operations risk — even when the sky is clear.
Sign Caution - Extreme Heat - Danger - indicates extreme heat and danger to life, Death Valley National Park, California, USA
Travellers are adjusting, rather than staying home
There is little evidence that Americans are abandoning summer travel, they are, however, becoming more willing to change plans when temperatures become uncomfortable or unsafe. Around four in 10 Americans said extreme heat was affecting their vacation plans in an AP-NORC Center for Public Affairs Research survey. Seven in 10 said heat had affected their family's outdoor activities, that distinction matters to destinations. A traveller who keeps a hotel reservation but abandons an afternoon walking tour, skips an outdoor attraction or swaps a hiking excursion for an indoor activity has not disappeared from the visitor economy. Their spending pattern has changed.
For destination management organisations, attractions and tour operators, the challenge is increasingly about when visitors spend their time outdoors and what alternatives are available when they cannot. Early-morning departures, evening sightseeing and indoor programming are likely to become more valuable during severe heat. Operators selling cycling, hiking, adventure and nature-based products have less room for improvisation: departure times, cancellation policies and alternative itineraries increasingly need to account for temperature, not simply rain.
Ground temperatures can far exceed air temperatures, radiating additional heat.
National parks feel the pressure first
Few parts of the US tourism economy expose that tension more clearly than the national parks. Grand Canyon National Park warned visitors this summer against strenuous Inner Canyon hiking between 10 a.m. and 4 p.m. after an influx of heat-related incidents. Temperatures can reach 109°F in the shade, according to the National Park Service.
Three apparent heat-related deaths were recorded during two incidents in June, the park service said. For tour operators, those warnings have practical consequences. A full-day itinerary designed around traditional sightseeing hours may simply cease to work during periods of extreme heat. Dawn departures become operational necessities rather than premium experiences. Guides need greater flexibility, while operators must decide when an excursion should be shortened, moved or cancelled.
The problem can compound quickly in the West, where extreme heat, drought and wildfire risk increasingly overlap. A destination does not have to close for the visitor experience to deteriorate. Smoke, fire restrictions, closed trails or dangerous afternoon temperatures can undermine an itinerary while hotels, roads and airports remain open. That grey area creates particular difficulties for operators deciding when to cancel, rebook or compensate customers.
Record travel meets a more difficult summer
None of this has stopped Americans travelling. AAA projected 72.2 million people would travel at least 50 miles from home during the extended Independence Day holiday period in 2026, edging above the previous year's record of 71.8 million.
Strong demand and worsening heat are therefore arriving at the same time. For hotels, the effect is less visible than an aircraft weight restriction or trail warning, but it reaches the operating budget. Longer periods of high temperatures increase air-conditioning demand and place greater pressure on employees working outside, from valet teams and maintenance crews to landscaping and recreation staff.
Resorts dependent on golf, hiking, pools and other outdoor amenities face another calculation. A high occupancy rate does not necessarily translate into the same ancillary revenue if guests retreat indoors for much of the afternoon. Destinations may eventually have to rethink what constitutes peak season.
Children playing behind an orange parasol on a sunny afternoon in Riverbank State Park in Harlem, New York City
The shoulder season gains a new role
For years, tourism businesses have promoted spring and autumn to spread demand beyond crowded summer months and improve asset utilisation. Heat gives that strategy a different urgency. In the hottest US markets, shifting more demand into April, May, September and October could become part of climate adaptation rather than simply yield management. Tour operators gain more reliable conditions, visitors can spend longer outdoors and destinations reduce some of the pressure concentrated in July and August.
Cooler northern and higher-altitude destinations may benefit as travellers look for alternatives, although recent heatwaves have shown that geography offers no guarantee. The bigger adjustment will be operational. A city tour automatically scheduled for mid-afternoon, a desert excursion leaving after lunch or a strenuous national park hike built around conventional visitor hours increasingly looks like a product designed for a climate that is changing.
NOAA's 2026 figures underline the direction of travel. Nine states recorded one of their 10 warmest Junes, while the Southwest's June temperature averaged 4.9°F above the 20th-century norm. Travel companies already build contingencies around hurricanes, thunderstorms, wildfires and winter weather. Heat is moving into the same category, but with a complication: it can disrupt a trip without producing the obvious cancellation event that activates established responses.
An airport remains open. A hotel continues operating. A national park welcomes visitors. Yet the flight may carry fewer passengers, the afternoon excursion may no longer be safe and the itinerary sold months earlier may need to be rewritten on the day. For the US travel industry, that is the emerging summer challenge. Demand remains strong, but delivering the trip travellers booked is becoming more weather-dependent.
The businesses that adapt will not necessarily be those that persuade travellers to tolerate hotter summers. They will be the ones that adjust schedules, products and operating practices early enough that travellers do not have to.
