Is Your IT Ready for the Heat? What the First 2026 Heatwave Taught Us

It's been quite a summer. The UK has experienced a series of record-breaking heatwaves in 2026, with temperatures reaching 37.7°C in Norfolk in late June, a new record for June. Most of us across Gloucestershire were focused on staying cool, keeping hydrated, and quietly envying anyone with a garden paddling pool.

But for businesses, the heatwave brought a less talked-about problem. Several NHS trusts and hospitals declared critical incidents as the heat led to the failure of IT systems and machines, including air conditioning units, MRI scanners, and other critical equipment. If extreme heat can bring down hospital infrastructure, it's worth asking: what would it do to yours?

Heat and IT don't mix well

Your IT equipment, including servers, switches, workstations, and laptops, all generate heat. Under normal conditions, office cooling keeps everything in check. But when ambient temperatures climb into the mid to high 30s, as they did across Gloucestershire this summer, cooling systems struggle to keep up. When they do, your hardware starts to suffer.

Overheating causes processors to throttle performance, systems to crash unexpectedly, and in serious cases, hardware to fail altogether. A server going down on a normal Tuesday is inconvenient. A server going down during a heatwave, when your team is already stretched, your internet is sluggish from everyone streaming fans on Amazon, and your IT support company is fielding calls from every direction, is a proper nightmare.

The three things most businesses overlook

1. Server room and cabinet temperatures Most businesses don't actively monitor the temperature inside their server cabinets. They should. During a heatwave, these enclosed spaces can reach dangerous temperatures surprisingly quickly, especially if the room's air conditioning is working overtime or fails entirely.

2. Laptop and desktop overheating Staff working from home during a heatwave face a different problem. No office air conditioning, poor ventilation, and devices sitting on soft surfaces blocking vents. Overheating laptops slow down, crash, and in some cases corrupt data mid-task.

3. No contingency when things go wrong The businesses that came through the heatwave best were the ones with a plan. Tested backups, cloud-based systems they could access from anywhere, and an IT partner they could call immediately when something went wrong. The ones who struggled were those finding out their backup hadn't worked in months, right at the moment they needed it most.

What you can do right now

The good news is that most of this is preventable with a bit of forward planning:

• Check your server room cooling and make sure air conditioning is serviced and working before the next hot spell, which forecasters say could return later this month.

• Monitor hardware temperatures using simple tools that alert you when temperatures hit concerning levels.

• Review your backup setup and actually test it. Knowing your data is safe is very different from assuming it is.

• Think about cloud as cloud-based systems are far less vulnerable to local hardware failures, whether caused by heat, power cuts, or anything else.

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A summer reminder from the Wavetree team

We've been supporting businesses across Gloucestershire for 15 years, and summers like this one are a useful reminder that IT resilience isn't just about cyber threats and software updates. Sometimes it's about making sure your kit doesn't melt.

If you're not sure how your setup would hold up in extreme conditions, or you've already had a wobble this summer and haven't quite got round to investigating why, we'd love to have a chat.

Heat damaged server room