During the past three months (June, July, and August), the effects of human-induced climate change — mainly from burning coal, oil, and methane gas — were evident in most regions of the world, particularly in the form of extreme heat. This analysis uses Climate Central’s Climate Shift Index (CSI) to determine the influence of climate change on temperatures around the globe during this period.

Key findings

• Every day from June to August 2025, at least one in five people on the planet felt a strong climate change influence.
• Nearly 955 million people experienced 30 or more days of risky heat added by climate change during the last three months. Risky heat days are days with temperatures hotter than 90% of the temperatures recorded in a local area from 1991 to 2020. Heat-related health risks rise when temperatures climb above this local threshold.
• In 183 countries, the average person experienced at least 30 days with temperatures strongly influenced by climate change. Most of these countries were in Asia.
• Cities in Europe and Asia top the list of locations where the average person experienced the most unusual heat this season.

Read the full report here.