El Niño and Construction: What a Hotter, Drier Climate Could Mean for the Construction Industry

In 2026, El Niño conditions are developing across the tropical Pacific. The World Meteorological Organization reported in June that there was an 80% probability of El Niño during June–August 2026, with the likelihood of the event continuing into November at around 90%. More recent forecasts indicate that the event could strengthen significantly towards the end of the year.

For Malaysia, this is particularly relevant. According to METMalaysia, moderate or strong El Niño conditions are typically associated with below-average rainfall in Peninsular Malaysia during the Southwest Monsoon from June to August. Sabah and Sarawak can experience reduced rainfall during both the Southwest and Northeast monsoon periods.

While El Niño does not automatically mean every day will be hot and dry, the potential for prolonged heat and reduced rainfall presents several considerations for the construction sector.

1. Heat stress could affect construction productivity

Construction is one of the industries most exposed to heat because many activities involve physically demanding outdoor work.

A 2024 meta-analysis published in BMC Public Health, which reviewed 14 studies involving 2,387 construction workers, found that 60% of workers exposed to elevated temperatures experienced significant productivity loss. The study highlighted heat exposure as an important factor affecting productivity in construction workforces. The implications are straightforward: when workers are exposed to excessive heat, they may need more frequent rest periods, work at a slower pace or adjust working hours to avoid the hottest part of the day.

This can ultimately affect project schedules.

The issue is also particularly relevant to Malaysia. A 2025 study by researchers from Universiti Tun Hussein Onn Malaysia, examining 200 Grade 6 and Grade 7 contractors in Johor Bahru, found that heat waves affected construction performance through reduced worker productivity, longer rest periods, project delays, additional safety measures and increased costs. The researchers also identified impacts on material exposure and work quality.

2. Project timelines and costs may come under pressure

When productivity falls, the effect can extend beyond individual workers.

Additional breaks, modified working hours and slower progress can contribute to longer project durations. Delays may then create additional labour, equipment, and operational costs. The Malaysian study by Azmi, Yaman and Mohammad (2025) specifically identified an interconnected relationship between heat waves, time, cost and quality, suggesting that extreme heat can increase the risk of projects taking longer and costing more to complete. For project managers and contractors, this highlights the importance of incorporating weather conditions into scheduling and contingency planning rather than treating extreme heat as an isolated site issue.

3. Materials and construction quality require closer attention

Extreme heat can also create challenges for materials and construction processes. Fresh concrete, for example, requires careful management under hot and dry conditions because rapid moisture loss can affect curing and finishing. Materials stored outdoors may also require additional protection from prolonged exposure to heat and direct sunlight. The 2025 Malaysian study noted that exposure of materials to heat, together with reduced worker focus, can contribute to poorer project quality. This makes proper material storage, concrete management and quality-control procedures even more important during periods of elevated temperatures.

4. Water management becomes increasingly important

A prolonged dry period can also place greater pressure on water resources at construction sites. Water is required for activities ranging from concrete curing and mixing to dust suppression, cleaning and general site operations. If rainfall is below average for an extended period, contractors may need to pay greater attention to water availability, storage and consumption. This could encourage wider adoption of water-efficient construction practices, recycling systems, and better site-level water management.

5. Construction schedules may need greater flexibilty

One important point is that El Niño does not simply mean “no rain.”

Weather conditions can vary significantly by location, and rainfall can still occur during an El Niño year. METMalaysia specifically notes that above- and below-average rainfall can occur even during years without El Niño or La Niña.

For construction teams, this means relying solely on seasonal assumptions may not be enough. Instead, projects could benefit from more responsive planning, including short-term weather forecasting, flexible work sequencing, contingency periods and real-time monitoring of site conditions.

6. Could El Niño accelerate climate-resilient construction?

While extreme weather creates challenges, it can also accelerate innovation within the built environment. As climate risks become more prominent, there could be growing demand for heat-resilient materials, energy-efficient buildings, passive cooling strategies, water-saving technologies, and smarter construction-site monitoring.

For architects, designers and developers, this also raises an important question: how should buildings be designed not only for today's climate but also for the conditions they may face throughout their operational lifetime?

Climate-responsive design could therefore become increasingly important—from building orientation and shading to ventilation, glazing, insulation, landscaping and water management.

Preparing for a hotter future

El Niño is a natural climate phenomenon, and its effects vary between regions and individual events. However, its development in 2026 is occurring against a backdrop of rising global temperatures, making heat resilience an increasingly important consideration for industries that depend heavily on outdoor work.

For construction, the question is therefore not simply: “How will El Niño affect construction?”

It is also: “How can the industry become more resilient to the changing conditions that El Niño represents?”

From protecting workers and improving site planning to adopting climate-responsive design and more efficient construction practices, preparing for environmental conditions will require collaboration across the entire built environment ecosystem. Because the future of construction isn't only about building bigger and faster, it is about building smarter, safer and more resiliently.