In many cities, heat arrives quietly. It does not knock on doors or announce itself with ceremony. Instead, it settles into the walls, the rooftops, and the narrow alleys where homes stand shoulder to shoulder. By afternoon, the air thickens, and by nightfall the warmth lingers, refusing to leave.
For millions living in informal settlements across Africa, heat is not merely a seasonal discomfort. It is something that seeps into daily life—into work schedules, sleep, health, and the fragile balance of household income.
A recent report examining several African communities suggests that extreme heat is steadily reshaping daily routines in some of the continent’s most densely populated neighborhoods. Researchers studying informal settlements in Nairobi, Dar es Salaam, and Kariba found that high temperatures are disrupting livelihoods, affecting health, and making restful sleep increasingly difficult.
The study, conducted by the International Institute for Environment and Development together with Slum Dwellers International, surveyed more than 1,000 residents in these communities. Their findings describe a pattern that many families already recognize in daily life: when temperatures rise, ordinary routines begin to unravel.
About a quarter of respondents said extreme heat had forced them to miss work or lose income during hot periods. In neighborhoods where livelihoods often depend on informal labor or home-based activities, even a single missed workday can echo across household budgets.
Sleep, too, becomes elusive when the heat refuses to fade after sunset. Around 40 percent of participants reported that hot nights kept them from resting properly. In some homes, indoor temperatures reached as high as 40 degrees Celsius, leaving residents searching for small pockets of relief in crowded rooms or along open windows.
The physical effects are equally difficult to ignore. More than two-thirds of those surveyed reported experiencing health problems linked to extreme heat. Symptoms ranged from heat exhaustion and dizziness to skin irritation and dehydration—conditions that can accumulate quietly but steadily during prolonged hot spells.
Part of the challenge lies in the design of informal settlements themselves. Homes are often built from corrugated metal sheets or other low-cost materials that absorb heat throughout the day. With limited green spaces and few trees to provide shade, temperatures inside these neighborhoods can climb higher than in surrounding areas.
For families with limited financial resources, coping with heat can also come at a cost. The report found that more than a third of households spent extra money trying to stay cool—purchasing water, fans, or other small solutions that together can account for roughly one-sixth of a household’s monthly income.
Researchers note that these pressures fall disproportionately on those already facing economic hardship. Unlike wealthier urban residents who may have access to air conditioning, insulation, or greener neighborhoods, many people living in informal settlements have fewer options for adapting to rising temperatures.
Women may experience additional risks, as they often spend more time cooking indoors or performing care-related work inside the home, where temperatures can be even higher during the hottest hours of the day.
Looking ahead, researchers say the findings highlight the need for practical responses to rising heat in rapidly growing cities. Possible measures include improving housing materials, increasing ventilation, expanding tree cover, and developing early warning systems for extreme heat events.
In the quiet language of statistics, the report describes something many residents already feel firsthand: that climate change is not only measured in degrees, but in interrupted sleep, missed workdays, and the slow exhaustion of daily life.
For now, the findings serve as a reminder that as cities continue to grow and temperatures continue to climb, the challenge of keeping urban neighborhoods livable may become one of the defining tasks of the years ahead.
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Sources Reuters The Japan Times Arab News Thomson Reuters Foundation International Institute for Environment and Development (IIED)