September 2026 second hottest on record; 1.5°C threshold breached again

Global temperature data for September 2026 shows it was the second hottest September on record, with the 1.5°C warming threshold exceeded again. This continues the recent trend of record or near-record temperatures, underscoring the persistent acceleration of climate change. The data reinforces the urgency of emissions reductions but does not represent a new deviation from the established warming pattern.