Cities around the world are facing a growing challenge as temperatures continue to rise. Hotter days and longer heatwaves are affecting how people live, work and travel, while also putting pressure on electricity systems, healthcare services, roads, buildings and water supplies.
Urban areas can be particularly vulnerable to extreme heat because concrete, asphalt and buildings absorb and retain heat. This can make cities significantly warmer than nearby rural areas, especially during the night when urban surfaces slowly release the heat they absorbed during the day.
The issue is becoming more important as global temperatures remain unusually high. The World Meteorological Organization confirmed that 2025 was one of the three warmest years ever recorded, with the period from 2015 to 2025 representing the 11 warmest years in the historical record.
Rising temperatures are therefore not simply an environmental concern. They are increasingly becoming an issue involving public health, infrastructure, transportation, housing, energy and the wider urban economy.
So, how are rising temperatures affecting cities?
Cities Can Become Hotter Than Surrounding Areas
One of the biggest challenges is the urban heat island effect.
Cities contain large amounts of concrete, asphalt, glass and other materials that absorb heat from sunlight.
At the same time, cities often have fewer trees and open green spaces than rural areas.
During the day, these surfaces become extremely hot. After sunset, they gradually release the stored heat.
As a result, urban neighborhoods can remain hot well into the night.
This matters because nighttime cooling is important for the human body.
If temperatures remain high after sunset, people may struggle to recover from daytime heat.
Heatwaves Are Becoming a Bigger Public-Health Concern
Extreme heat can be dangerous, particularly during prolonged heatwaves.
High temperatures can increase the risk of dehydration, heat exhaustion and other heat-related illnesses.
Older adults, young children, people with certain health conditions and outdoor workers can be particularly vulnerable.
Heat can also put pressure on hospitals and emergency services.
During severe heatwaves, medical facilities may experience more patients suffering from heat-related problems.
Cities therefore need effective heat-response plans.
These can include public warnings, cooling centers, emergency services and outreach programs for vulnerable residents.
Workers Are Feeling the Impact
Rising temperatures can also affect the workplace.
Outdoor workers in construction, agriculture, transportation, maintenance and other industries may face dangerous conditions during periods of extreme heat.
Even indoor workers can be affected if buildings lack adequate ventilation or cooling.
High temperatures can reduce concentration and physical performance.
Businesses may need to change working hours, introduce additional breaks or improve workplace cooling systems.
For some industries, these changes can increase operating costs.
Electricity Demand Can Rise
One of the most immediate effects of extreme heat is increased demand for electricity.
When temperatures rise, more households and businesses use air conditioning, fans and refrigeration.
This can place significant pressure on electricity networks.
During a severe heatwave, electricity demand may reach unusually high levels.
If power infrastructure is not prepared for these conditions, cities can face outages.
This creates a difficult cycle.
People need electricity to stay cool, but extreme heat can increase the strain on the very systems that provide that electricity.
Higher Energy Bills Can Affect Households
More air-conditioning use can also increase household electricity bills.
For families with limited incomes, this can create a difficult choice between maintaining a safe indoor temperature and keeping energy costs manageable.
Some households may reduce their use of cooling equipment because of high electricity costs.
This can increase their exposure to extreme heat.
Improving building efficiency can help.
Better insulation, reflective roofs, ventilation and energy-efficient cooling systems can reduce the amount of electricity required to maintain comfortable indoor temperatures.
Buildings Are Being Put Under Greater Pressure
High temperatures can affect buildings and construction materials.
Road surfaces can soften during extreme heat.
Some materials can expand and contract as temperatures change.
Buildings may require more cooling, increasing energy consumption.
Older structures can be particularly vulnerable if they were not designed for today’s temperature conditions.
Cities may therefore need to update building standards.
New buildings could be designed with better ventilation, shade, insulation and energy efficiency.
Roads and Transportation Can Be Affected
Transportation systems can also experience problems during extreme heat.
Very high temperatures can damage road surfaces and place additional stress on rail infrastructure.
Public transportation systems may have to introduce special measures during heatwaves.
Passengers can also face uncomfortable or dangerous conditions when waiting at exposed bus stops or train stations.
Cities can respond by increasing shade, improving ventilation and providing better access to drinking water.
Tree-lined streets can also make walking and cycling more comfortable.
Water Demand Can Increase
Hot weather can increase demand for water.
People need more water for drinking, bathing and cooling.
Parks and gardens may also require additional irrigation.
At the same time, drought can reduce available water supplies.
This creates a difficult situation for cities.
Water authorities may have to introduce restrictions or encourage residents to reduce unnecessary consumption.
Long-term planning is becoming increasingly important in cities facing both higher temperatures and water shortages.
Green Spaces Can Help Cities Stay Cooler
Trees and vegetation can play an important role in reducing urban heat.
Trees provide shade and release water vapor through a process called evapotranspiration.
Parks and green spaces can therefore create cooler areas within cities.
Green infrastructure can also provide other benefits.
It can improve air quality, support biodiversity and provide recreational areas for residents.
For these reasons, many cities are investing in tree planting and expanding urban green spaces.
However, simply planting trees is not enough.
Cities also need to choose appropriate species, provide adequate water and protect existing mature trees.
Rooftops Could Become Part of the Solution
Roofs can absorb large amounts of solar energy.
Traditional dark roofs can become extremely hot during sunny weather.
Reflective or “cool” roofs can reduce heat absorption.
Green roofs, which use vegetation, can provide additional cooling and help manage rainwater.
Some cities are encouraging or requiring new developments to incorporate these approaches.
These measures can reduce indoor temperatures and lower demand for air conditioning.
Urban Planning Is Changing
Rising temperatures are forcing city planners to reconsider how neighborhoods are designed.
Wide areas of asphalt and concrete can create intense heat.
Poorly designed neighborhoods may also lack shade and access to green spaces.
Urban planners are therefore looking at ways to increase tree cover, improve ventilation and create shaded public areas.
Building orientation can also influence how much sunlight reaches streets and buildings.
Future cities may increasingly be designed around heat resilience rather than simply population growth and transportation efficiency.
Low-Income Communities Can Face Greater Risks
Heat does not affect all residents equally.
People living in low-income neighborhoods may have less access to air conditioning, green spaces and well-insulated housing.
They may also work in outdoor or physically demanding jobs.
This can increase their exposure to extreme temperatures.
Some communities may also be located in areas with fewer trees and more paved surfaces.
Addressing urban heat therefore involves an important question of fairness.
Cities need to make sure that climate adaptation measures benefit vulnerable communities rather than only wealthier neighborhoods.
Rising Temperatures Can Affect Air Quality
Extreme heat can also interact with air pollution.
Hot weather can contribute to the formation of ground-level ozone in some conditions.
Wildfire smoke can further worsen air quality when fires occur in or near urban areas.
Poor air quality combined with extreme heat can create additional health risks.
Cities therefore need to consider heat and air pollution together when developing public-health strategies.
Businesses Are Preparing for More Heat
Businesses are also beginning to consider the financial effects of rising temperatures.
Retail stores, restaurants, factories, warehouses and offices may require more cooling.
Outdoor businesses may face reduced productivity.
Tourism can also be affected if visitors avoid destinations during periods of extreme heat.
Companies may need to invest in better buildings, cooling systems and workplace policies.
For large businesses, these investments can be part of long-term climate-risk planning.
For small businesses, however, the cost can be more difficult to manage.
Insurance Risks Could Increase
Rising temperatures can indirectly affect insurance markets.
Extreme heat can contribute to wildfires, infrastructure damage and other hazards.
As climate-related risks increase, insurers may reassess premiums and coverage in vulnerable areas.
Higher insurance costs can increase the cost of owning homes and operating businesses.
In some high-risk locations, obtaining affordable coverage could become more difficult.
This creates another financial challenge for cities.
Cities Are Investing in Heat Adaptation
Many urban governments are developing strategies to deal with rising temperatures.
These can include:
- Planting more trees
- Creating shaded public spaces
- Opening cooling centers
- Improving building insulation
- Installing reflective roofs
- Expanding parks
- Improving public-health warnings
- Upgrading electricity networks
- Protecting water supplies
- Changing working-hour recommendations during extreme heat
The most effective approach will depend on the city’s climate, infrastructure and available resources.
Technology Can Help
Technology is also becoming an important part of urban heat management.
Cities can use sensors and satellites to identify neighborhoods that experience the highest temperatures.
Weather forecasting can provide earlier warnings of heatwaves.
Smart electricity systems can help utilities manage periods of unusually high demand.
Digital mapping can also help planners identify areas that lack trees and shade.
These tools can make city responses more targeted.
What Could Cities Look Like in the Future?
The cities of the future may look different as governments adapt to higher temperatures.
More streets could include trees and shaded walkways.
Buildings could use reflective materials and energy-efficient cooling.
Public spaces could include water features and shaded areas.
Transport systems could be designed to provide better protection from heat.
New housing developments may be required to meet stronger climate-resilience standards.
These changes could make cities more comfortable even beyond periods of extreme weather.
Final Thoughts
So, how are rising temperatures affecting cities?
They are affecting public health, electricity demand, water supplies, transportation, buildings, businesses, workplaces and household budgets.
The urban heat island effect can make cities even hotter than surrounding areas, increasing the risks associated with heatwaves.
The challenge is becoming more urgent as global temperatures remain unusually high.
However, cities have many options.
Planting trees, expanding green spaces, improving buildings, strengthening electricity networks and developing effective heat-warning systems can all help reduce the impact of extreme temperatures.
The most important lesson is that urban planning and climate adaptation need to work together.
Cities cannot control global temperatures on their own, but they can control how prepared they are for them.
As more people live in urban areas, creating cities that can remain safe, healthy and functional during periods of extreme heat will become increasingly important.
The decisions made by city governments, developers, businesses and residents today could determine how well urban communities cope with hotter conditions in the years ahead.
