Karachi Heatwave Alert: Temperatures May Climb to 42°C

Karachi is preparing for a fresh heatwave from June 10 to June 12, with daytime temperatures expected to climb as high as 42°C, according to the Pakistan Meteorological Department. The advisory has put Pakistan’s largest city on alert as residents brace for a spell of intense heat during the working week.

The forecast suggests that actual temperatures may range between 39°C and 42°C, but the conditions could feel considerably harsher because of humidity and the city’s coastal climate. Weather officials warned that the perceived temperature may rise 8°C to 10°C above the recorded reading, creating dangerous conditions for outdoor movement.

On Tuesday, Karachi recorded a maximum temperature of 36.5°C, but the discomfort level was far higher because humidity touched 62 percent. The heat index was estimated at nearly 48°C, showing how moisture in the air can make conditions feel far more severe than the official temperature figure.

The PMD said northwesterly winds were blowing through the city at speeds of around 22 to 25 kilometres per hour. Health experts urged citizens to take the warning seriously, especially children, elderly people, women and those already suffering from heart, respiratory or other long-term medical conditions.

Residents have been advised to reduce unnecessary outdoor activity, particularly between 10am and 4pm, when sunlight and heat exposure are usually at their highest. Doctors also recommend regular water intake, use of oral rehydration salts where needed, light clothing and immediate rest in shaded or cooler places if dizziness, weakness or nausea develops.

Karachi has faced repeated episodes of extreme heat in recent years, with dense urban construction, reduced tree cover, power supply pressure and high population concentration increasing the impact on daily life. Heatwaves can quickly become public health emergencies in cities where many workers depend on outdoor labour, public transport and informal markets.

The expected hot spell may also affect schools, street vendors, traffic police, delivery riders and labourers who remain exposed for long hours. Hospitals and clinics could see a rise in heat exhaustion and dehydration cases if residents do not take precautions or if electricity disruptions limit access to fans, cooling and drinking water.

For Pakistan, Karachi’s weather alerts matter beyond one city because the port metropolis is the country’s commercial engine. Extreme heat can disrupt work routines, slow transport, increase electricity demand and place pressure on public services at a time when urban resilience remains a growing policy challenge.

The next 72 hours will be critical for public preparedness. Authorities, employers and households are expected to monitor PMD updates, adjust outdoor schedules where possible and ensure that vulnerable people have access to shade, water and timely medical help if symptoms of heat stress appear.