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Climate Change Shrinks Hajj Safety Window
Coverage from Mongabay, Yale E360, and others
Human-caused warming is making extreme heat more common in historically cooler months during the Hajj pilgrimage in Mecca, shrinking the seasonal window for safer conditions.
World Weather Attribution researchers estimate that May temperatures are now about 3.5°C warmer than in a preindustrial climate, while heat above 40°C is becoming more frequent. Saudi Arabia has expanded cooling and heat-response measures, but researchers warn that continued warming could outpace adaptation and expose millions of pilgrims to greater health risks.
The update sharpens the heat-risk assessment by adding a clearer frequency estimate for dangerous May temperatures and reinforcing that warming is outpacing Saudi adaptation efforts. It also reframes the 2024 Hajj as having been even more extreme than before, with reported temperatures above 50°C.
The story now emphasizes that Hajj heat risk is worsening across more of the pilgrimage window and may increasingly outpace Saudi mitigation measures. It also reframes the threat around prolonged outdoor exposure and crowding, not just peak temperatures.