Karachi and the New Reality of Extreme Heat

Karachi is no stranger to hot weather. Summers have always been intense in Pakistan’s largest city, where millions live along the Arabian Sea under crowded conditions and aging infrastructure. But something has changed in recent years. The heat is no longer seasonal discomfort — it is becoming a constant threat to daily life.

This year, temperatures in Karachi climbed above 44°C, pushing the city into another brutal heatwave. Streets emptied during the afternoon, power outages became unbearable, and hospitals began reporting growing numbers of patients suffering from dehydration and heat-related illnesses. For many residents, especially those who work outdoors, survival itself is becoming harder.

In neighborhoods near the coast, fishermen and laborers continue working despite the dangerous temperatures because they have little choice. Many spend hours under direct sunlight, often without proper access to clean drinking water or cooling spaces. Families describe sleepless nights caused by high humidity and electricity cuts that leave homes feeling like ovens.

What makes Karachi’s situation especially dangerous is the combination of heat and humidity. Even when temperatures appear lower than in desert regions, the moisture in the air prevents the body from cooling properly. Experts warn that these conditions can quickly become life-threatening, particularly for children, elderly people, and workers exposed to the sun for long periods.

The city has experienced deadly heatwaves before. In 2015, thousands of people died during an extreme weather event that overwhelmed hospitals and emergency services. Many believed it was a rare disaster. Today, climate scientists say such heatwaves are becoming more frequent and more intense because of global warming.

Rapid urbanization has made the problem worse. Karachi’s expanding concrete landscape traps heat during the day and releases it slowly at night, creating what experts call the “urban heat island” effect. Green spaces continue to disappear while traffic, pollution, and overcrowding add even more stress to the environment.

Healthcare workers are already seeing the consequences. Clinics across the city report spikes in dehydration, heat exhaustion, diarrhea, and respiratory problems during periods of extreme weather. Doctors warn that rising nighttime temperatures are particularly dangerous because the human body never gets a chance to recover from daytime heat.

Climate researchers believe South Asia is becoming one of the world’s most vulnerable regions to extreme heat. Cities like Karachi may face longer and harsher summers in the coming decades, forcing governments to rethink urban planning, healthcare systems, and emergency preparedness.

Some solutions are already being discussed: cooling centers, improved water access, better public warning systems, and large-scale tree planting projects. But for millions living in Karachi today, the crisis is no longer about the future. It is already shaping everyday life.

Extreme heat is no longer an exceptional event in Karachi. It is becoming the city’s new normal.