Bangladesh is heading toward a drastically hotter and wetter future as climate change accelerates, with scientists warning that daytime temperatures could rise by up to 4.5°C by the end of the century and winter may all but disappear in many regions.
The country — already among the world’s most climate-vulnerable — faces converging threats from rising heat, heavier monsoon rains, sinking coastlines, stronger storm surges, and expanding disease burdens, according to the latest scientific evidence from the IPCC’s Sixth Assessment Report and Bangladesh-specific climate studies.
The report, titled “The Future Climate of Bangladesh,” was jointly developed by the Bangladesh Meteorological Department and the Norwegian Meteorological Institute, with technical support from Save the Children.
Meteorologists say Bangladesh’s climate is shifting so rapidly that traditional seasons may be unrecognizable within decades.
Heatwaves are projected to become far more frequent, prolonged and humid — particularly in urban and coastal regions — while the country’s mild winter may fade almost entirely.
“The trend of climate change is accelerating, and the warming of our planet is now unmistakable,” said Md Momenul Islam, director at the Bangladesh Meteorological Department.
“If global emissions continue at the current rate, Bangladesh could see a mean temperature rise of 1–2°C by mid-century and 1.5–4.5°C by 2100. Monsoon rainfall may increase by up to 15%, especially in northern districts.”
Such warming would dramatically alter daily life, agriculture, worker productivity and public health, making heat stress a year-round threat.
Coastline sinking
Bangladesh’s vulnerability is worsened by “vertical land motion,” the rising or sinking of land relative to the sea.
In the Ganges-Brahmaputra Delta, land is sinking by up to 4mm per year due to tectonic shifts and extensive groundwater extraction, wetland drainage and mangrove loss.
Under a high-emission scenario, global sea levels could rise 0.77 meter by 2100, but local factors mean Bangladesh may experience even greater impacts.
Scientists warn that sea levels will continue rising for centuries, posing escalating risks to low-lying regions where millions live.
The Bay of Bengal is projected to see fewer cyclones in number but more devastating impacts from each event.
Rising seas will dramatically amplify storm surges.
A modelling study by Khan et al. (2022) shows that a surge considered a 50-year event today could resemble a 260–300-year extreme by the end of the century.
The Meghna estuary, the Padma-Meghna corridor, the Sundarbans and northwest Bhola are identified as the most vulnerable zones, with inundated areas in parts of Barisal and the lower delta potentially doubling.
Chronic coastal losses
A 2024 ICCCAD assessment warns that sea levels along Bangladesh’s coast are rising 3.8–5.8mm per year, well above the global mean.
By 2100, 12–18% of coastal land could be permanently submerged.
Salinity intrusion will intensify drinking-water shortages, damage agriculture and devastate fisheries.
The Sundarbans, mostly under one metre in elevation, faces existential risk.
Up to 23% of the mangrove forest could be underwater in a high-emission scenario, undermining biodiversity and weakening the natural cyclone barrier that protects millions.
Heat, pollution and fast-spreading diseases
Bangladesh is warming rapidly, with nighttime temperatures rising faster than daytime averages.
Heatwaves are becoming longer and deadlier, causing heatstroke, cardiovascular strain and rising hospital admissions.
A 2025 study by Raza et al. found that a 1% rise in extreme-heat days increases child stunting risk by 56%, and exposure in the first two years of life raises it by 67%.
Dhaka faces compounding risks as extreme heat worsens air pollution, trapping particulates and increasing ground-level ozone.
Climate change is also expanding the range of mosquito-borne diseases.
Dengue and malaria are spreading into new regions, while salinity-driven water contamination has increased cholera outbreaks, as seen after Cyclone Aila in 2009.
Temperature rise and salinity intrusion are damaging rice, wheat, freshwater fisheries and livestock.
This threatens the livelihoods of the 37% of Bangladeshis employed in agriculture.
Despite REDD+ commitments, deforestation continues in Chattogram Hill Tracts and peri-urban zones.
Mangrove degradation further weakens coastal resilience.
By 2050, chronic sea level rise could permanently displace 900,000 people in the south.
Emissions will decide fate
Bangladesh is globally recognized for cutting cyclone fatalities dramatically through the Cyclone Preparedness Programme, 4,000+ shelters, saline-resistant crops and community-based adaptation.
National plans like the Delta Plan 2100, Adaptation Plan 2023–2030 and Mujib Climate Prosperity Plan outline ambitious strategies.
However, experts say major gaps remain, particularly in climate-proofing health systems and protecting the urban poor.
While Bangladesh contributes only a negligible share to global emissions, it bears a disproportionate burden of their consequences.
Scientists warn that unless major emitters slash fossil-fuel use, Bangladesh will face hotter cities, shrinking coasts, collapsing ecosystems and growing displacement — even under strong domestic adaptation.
“Bangladesh’s future,” a senior climate scientist said, “will be shaped not just by what the country does — but by what the world chooses to do now.”