London Heatwave Ends: Why Temperatures Fell from 34°C to 29°C – And What to Expect in July & August

Published: June 27, 2026

For several days, London felt more like southern Europe than the United Kingdom. Temperatures climbed to around 34°C, parks were packed with people, public transport became uncomfortable, and many homes struggled without air conditioning.

Today, however, temperatures have eased to around 29°C, and forecasts suggest next week will return closer to the seasonal average of 25°C.

But does this mean summer is over?

Not at all.

Why Was London So Hot?

This week’s heatwave was caused by a combination of weather patterns rarely aligning at the same time.

A strong area of high pressure settled over western Europe, allowing very warm air from Spain and France to move north across the English Channel. At the same time, clear skies and light winds allowed London to heat rapidly during the day.

The city’s dense buildings, roads and concrete also created the well-known Urban Heat Island effect, making central London noticeably warmer than surrounding countryside. Scientists also point to long-term climate change, which is increasing both the frequency and intensity of UK heatwaves.

Why Is It Cooler Today?

The recent drop in temperature isn’t because summer has disappeared.

Instead, cooler Atlantic air has pushed into southern England, replacing the hot continental air that fuelled this week’s heatwave.

This is typical British weather-rapid changes between warm continental air and cooler Atlantic systems.

Next week should feel far more comfortable, with highs generally around 24–26°C, although it will still remain warmer than average for late June.

Could Another Heatwave Arrive?

Yes.

According to the UK Met Office’s seasonal outlook, there is a higher-than-normal chance of additional hot spells during July and August.

That does not guarantee constant heat. Instead, it means the probability of further heatwaves is above the long-term average. Warm periods are likely to alternate with cooler Atlantic weather, which is typical of the UK climate.

Advice for Tourists Visiting London This Summer

If you’re travelling to London in July or August, don’t assume British weather will always be cool.

Even when forecasts suggest 25-30°C, the combination of sunshine, humidity and limited air conditioning can make the city feel much hotter.

A few simple precautions can make a big difference:

•⁠ ⁠Carry a reusable water bottle.
•⁠ ⁠Wear a hat and apply sunscreen regularly.
•⁠ ⁠Plan walking tours in the morning or evening.
•⁠ ⁠Use public parks to rest in shaded areas.
•⁠ ⁠Check the weather before travelling each day.

Stay Safe Around Water

Heatwaves often encourage people to cool off in rivers, lakes and reservoirs.

However, these locations can be dangerous. Cold-water shock, hidden currents and sudden changes in depth cause serious accidents every summer in the UK. Even experienced swimmers can get into difficulty.

Visitors should always choose supervised swimming locations where possible and avoid entering unfamiliar open water.

Final Thoughts

The worst of this week’s extreme heat appears to be over, but London’s summer is far from finished.

With July and August still ahead, more hot spells remain possible. Whether you’re a London resident or visiting from overseas, staying informed and prepared will help you enjoy the city safely.

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London Heatwave 2026: Why Temperatures Dropped and What to Expect This Summer

London’s record-breaking heatwave has eased, but could more extreme temperatures arrive in July and August? Here’s what travellers and residents need to know.

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