Harmfully hot days for pregnant women in Japan nearly doubled over past five years
- Climate Central reported in 2025 that harmful heat days for pregnant women nearly doubled in Japan and worldwide from 2020 to 2024.
- The increase stemmed from human-driven climate change raising extreme temperatures beyond the 95th percentile of local historical norms since 1991-2020.
- This rise occurred in 222 of 247 countries and territories, with the U.S. Adding 12 pregnancy heat-risk days annually and Hawaii’s days increasing from one to 21 on average.
- Kristina Dahl of Climate Central emphasized that just one instance of intense heat can significantly increase the likelihood of severe complications during pregnancy, underscoring a mounting global concern for maternal health.
- Experts emphasized that reducing fossil fuel emissions remains essential to protect pregnant people and newborns by mitigating further climate-driven heat risks.
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11 Articles
Heat-Risk Days for Pregnant People Have Doubled Worldwide Over Last 5 Years
A new report from Climate Central, a nonprofit news organization that analyzes climate science, showcases how the climate crisis has contributed to a growing risk for pregnant people around the world. According to the report, the number of pregnancy heat-risk days — defined as days that are hotter than 95 percent of local temperatures recorded from 1991 to 2020 — has doubled across the globe… Source
The Number of Pregnancy Heat Risk Days Have Doubled
The hotter the temperatures, the riskier the pregnancy. A Climate Central analysis largely found that to be true when it looked at data collected between 2020 and 2024. Climate Central studied daily temperatures in 247 countries and 940 global cities during that time period to determine the number of pregnancy heat-risk days. That classification, which is associated with an increased risk of preterm birth, is given to days with maximum temperatu…
Climate-driven extreme heat poses 'severe threat' to pregnancies, new report finds - Halifax Examiner
Published Wednesday, the new report says it offers the "first analysis directly quantifying how climate change is increasing dangerously hot days for pregnant people.”

Extreme heat could make pregnancy riskier for millions of women: Report
Oscar Wong via Getty Images (WEST PALM BEACH, FL) — As human-induced climate change continues warming the planet, pregnancy risks are increasing, according to a new analysis by Climate Central. Climate Central, a nonprofit science and communications organization, analyzed daily temperature data from 2020 to 2024 in 940 cities across 247 counties and territories. Researchers looked for “extreme heat days,” which are defined by temperatures that g…
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