The UK and Ireland are experiencing an extreme marine heatwave, with sea temperatures currently 4°C above the seasonal average. This unusual warmth has attracted many wild swimmers, as British waters have seen their highest temperatures for mid-June levels coinciding with an exceptionally warm spring. The heatwave is characterized by temperatures exceeding the seasonal threshold for over five days, and certain areas have recorded temperatures 4.6°C above average. While this phenomenon provides warmer swimming conditions, current sea temperatures are still lower than the peak usually observed in late summer.
Prolonged high-pressure systems brought a dry, sunny spring and warmer waters, leading to what is one of the longest marine heatwaves on record in the UK.
Temperatures reached an average of 12.69°C well above the heatwave threshold of 11.3°C for May, indicating a significant increase in sea temperatures this season.
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