Your internet runs on metal, water, and power: all failing in extreme heat

Summer is officially here. We can see it everywhere, from the hydration breaks at the World Cup in the US to the searing heat across Europe, where 40 °C has become the norm.

In a cruel irony, we are told that the rising use of air-conditioning, which offers much-needed relief, might also be intensifying global warming. If that wasn't bad enough, many also believe that the summer heat waves indirectly expose the fragility of the internet and our reliance on AI.

The weak points of the internet connection we all take for granted are often the power grid, cooling systems, and local telecom equipment. The problem is that extreme heat increases electricity demand for air conditioning, reduces grid efficiency, and increases the risk of outages. All of which can quickly cascade into failures across broadband, mobile, and data centers.

The internet runs on physical infrastructure, not magic

Every AI-based request for information, every cloud-based service or application, every video stream, and every financial transaction depends on a data center infrastructure that must operate within acceptable temperature ranges.

The recent proliferation of "AI" servers (which have consumed significantly more energy than their predecessors) has generated such massive amounts of heat that operators are forced to adopt liquid-cooling systems that depend on reliable water supplies.

According to the World Economic Forum, by 2055, climate-related disasters (extreme heat, drought) will increase total costs for global data center operations from an estimated $1 trillion to approximately $3.3 trillion.

Data centers are now under increasing strain from severe weather events as they attempt to provide sufficient computing power for artificial intelligence applications while ensuring their hardware does not fail.

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What was once viewed as an environmental issue is increasingly becoming a business continuity issue, with climate resilience emerging as a determining factor in the future reliability of the internet itself.

Emerging research suggests the impact of AI infrastructure may extend beyond energy consumption and water usage.

The rise of data center heat islands

Researchers from the University of Cambridge have recently discovered that large hyperscale data centers may generate localized "heat islands," raising temperatures around the center by approximately 3.6° F on average and up to 16.4° F in some instances.

The researchers studied over 6,000 data centers and concluded that the heating effect may extend up to 6 miles beyond each data center's perimeter and affect an estimated 340+ million individuals worldwide.

While some have cautioned about the potential extent of these impacts, this raises new questions about when and how the rapidly expanding use of infrastructure for AI will affect individual localities at a time when global populations are experiencing higher temperatures and more frequent, intense heat waves.

Data centers are particularly vulnerable because they generate significant amounts of heat, requiring continuous cooling. In recent years, numerous reports have warned that elevated temperatures, water shortages, and electrical failures can compromise the operation of AI data centers.

Despite being over a decade old, an outage in Perth served as an early indication of future vulnerability and a timely reminder that, although there are many references to "the cloud," the internet relies on physical assets such as servers, cooling systems, cables, and power supplies. We also learned that the internet is susceptible to the same environmental factors that affect roads, railways, and energy networks.

There is so much more to the internet's vulnerabilities than a single heat wave or an isolated outage. According to research from XDI, which analyzed almost 9,000 operational and planned data centers worldwide, many of the most important digital hubs will experience dramatic increases in flooding, storms, wildfires, and other climate-related threats. These types of events could occur as often as 10 times more frequently by 2050.

The research suggests that insurance costs for data centers could increase by as much as 300 percent over the next twenty-five (25) years, depending on how well data center operators adapt to evolving climate risks.

According to the study, the ability of data centers to function effectively in the face of natural disaster disruptions depends on the reliability of supporting regional infrastructure, including, but not limited to, power grids, water supplies, and communication networks.

The summer stress test for mobile and broadband providers

The good news is that mobile networks were designed to withstand extreme weather. Heat affects radio system components such as the mast (tower), battery, radio, and cooling systems.

Most large operators use extensive air conditioning and cooling to reduce the risk of overheating failures.

Consumer behavior may create issues, however, because thousands of people will go to beaches, resulting in high traffic at these remote locations with limited backhaul capacity. As a result, consumers experience service degradation due to congestion and availability issues before a failure caused by excessive temperatures.

Mobile broadband relies on numerous layers of cable, cabinets, exchanges, cell towers, and data centers, each operating independently. But research conducted by Broadband.co.uk showed download speed losses of 1% to 8%, while upload speed losses ranged from 2% to 27%, when the temperatures hit 35 °C in the UK.

The bigger lesson

Despite rising temperature extremes, it has been demonstrated that the internet's dependability relies heavily on both the grid that supports it and its cooling systems. However, contrary to many sensationalized headlines that have appeared in print recently, high temperatures will not "break" the internet.

The data collected by Cloudflare in its Q1 2026 disruption report shows that the primary causes of internet service outages are shutdowns, conflicts, power shortages, and grid failures.

Heat is just one pressure. But it also amplifies the others by placing additional strain on electricity networks, cooling equipment, and telecom facilities.

So, the message is that heat waves won't bring down the internet. But they do reveal how dependent our digital life is on physical infrastructure built for yesterday's climate.

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