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June Sea-Surface Temperatures Reach New High as Europe Records Severe Late-June Heat

Experts warn a strengthening El Niño plus long-term human-driven warming could raise the odds of further heat extremes and strain oceans and public health systems.

Overview

  • Copernicus data show global sea-surface temperatures in June reached record highs, peaking around 20.9–21°C and marking unusual ocean warmth for the month.
  • A late-June heatwave swept Western and Central Europe, exposing millions to 35°C or higher and producing one of Spain’s hottest Junes on record according to Aemet.
  • Spain’s MoMo monitoring system issued preliminary estimates that nearly 900 excess deaths in June were linked to the extreme heat, with over 600 occurring during the most intense week.
  • Regional impacts included very high ground and air temperatures in Ukraine, where soil surface readings reached 55–63°C and forecasts on July 2 called for daytime highs up to 35–37°C in central and southern areas.
  • Scientists say the events are consistent with a strengthening El Niño working on top of long-term anthropogenic warming, which raises risks to marine ecosystems, agriculture, and health systems even though the future intensity and persistence remain uncertain.