As global temperatures continue to rise, researchers and public health experts warn that extreme heat is becoming a serious threat to children’s health, development, and education. Young children, especially those under the age of five, and those living in low-income communities face the greatest risks. From physical illness and disrupted sleep to declining academic performance, the effects of extreme heat are reaching beyond simple discomfort, raising concerns for the safety of children.
Children are biologically more vulnerable to heat than adults. Children have higher surface-area-to-body mass ratios, meaning that their bodies absorb heat more quickly and lose fluids faster, increasing the risk of dehydration, heat exhaustion, and heatstroke. In severe cases, prolonged exposure to extreme temperatures can lead to life-threatening conditions such as kidney failure and heat-related mortality.
High temperatures also worsen existing health conditions and create new ones. Heat can intensify respiratory conditions like asthma and allergies, which are already common among children. Warmer climates also help disease-carrying insects thrive, increasing the spread of illnesses such as malaria and dengue fever in many parts of the world. Additionally, rising temperatures contribute to heatwaves and droughts that threaten food production, reducing food security in vulnerable regions. Malnutrition resulting from these shortages is responsible for nearly half of all deaths among children under five in developing countries.
Beyond physical health, extreme heat can significantly affect children’s cognitive development and educational progress. Research has shown that students exposed to consistently high temperatures struggle more in school. A study published in the Journal of Child Psychology and Psychiatry found that children living in areas where the average monthly high temperature reach 86℉ were 5-7% less likely to reach basic cognitive milestones in reading and math. In the study, only about 63% of children were developmentally on track.
Heat also disrupts the learning environment itself. In classrooms without a proper cooling system, students often find it difficult to concentrate, leading to lower attendance and reduced academic performance. Researchers estimate that for every 1℉ increase in average annual temperature, learning declines by about 1% in schools lacking adequate air conditioning. In extreme conditions, some schools even close temporarily, further interrupting students’ education.
The mental and emotional effects of extreme heat are also a growing concern. Hot temperatures can cause irritability, restlessness, and mental stress in children. Sleep disruption, common during heatwaves, can further harm children’s development, since consistent sleep is essential for memory formation, emotional regulation, and brain growth. Studies have also linked high temperatures with increases in family stress and domestic conflict. When adults become more impulsive or aggressive during extreme heat, children may face higher risks of emotional harm.
Infants and unborn children are particularly vulnerable. Elevated temperatures have been associated with increased risks of preterm births, low birth weight, and stillbirths. After birth, infants may also face higher risk of sudden infant death syndrome (SIDS) when exposed to excessive heat.
The impact of extreme heat is not felt equally. Children from lower-income families—especially those living in densely populated urban areas—often experience the worst conditions. Many lack access to air conditioning, reliable electricity, clean drinking water, or shaded outdoor spaces. Urban “heat islands,” where concrete and asphalt trap heat, can make neighborhoods several degrees hotter than surrounding areas, further increasing risks for these communities.
As climate change continues to intensify heatwaves around the world, researchers emphasize that protecting children must remain a priority. Without action, rising temperatures could threaten not only children’s immediate health, but also their long-term development, education, and future opportunities. Ensuring safe environments at home, in schools, and within communities will be key to safeguarding the next generation in a warming world.
