- UK waters are experiencing a prolonged marine heatwave, with surface temperatures currently averaging 2C above normal and reaching levels typically seen in August.
- Forecasters predict this marine heatwave will intensify to "extreme" levels next week, a classification rarely recorded in UK waters.
- Some offshore regions along the English and Welsh coasts are seeing temperatures 4-5C higher than usual, with the English Channel already in marine heatwave conditions for much of 2026.
- Experts warn these record-breaking temperatures, exacerbated by climate change and a recent "heat dome," will significantly impact weather patterns, global climate and marine ecosystems, potentially altering fish populations and harming species.
- The Met Office advises caution regarding cold water shock for swimmers, despite the elevated sea temperatures, and recommends using RNLI lifeguarded beaches.
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