Record high ocean temperatures off southern California raise fears of prolonged marine heatwave

The Guardian US News
by Roque Planas
April 4, 2026
3 min read

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The Bottom Line

Ocean temperatures off southern California have hit record highs, with researchers warning of a prolonged marine heatwave.

How This Affects You

Coastal residents dependent on fishing or seafood may face higher prices and reduced availability as marine heatwaves disrupt fish populations and kelp forests that support Pacific food webs.

AI Summary

Ocean temperatures off southern California have hit record highs, prompting researchers to warn of a potential prolonged marine heatwave. Scripps Institution of Oceanography shoreline stations, which have tracked water temperatures for over a century, have recorded multiple record-breaking daily highs in recent months, with data suggesting sustained high-pressure conditions. Researchers caution that if these conditions persist, they could disrupt marine life and ecosystems along the coast. The sustained warming represents a significant shift from historical baseline temperatures and may indicate broader climate patterns affecting the region. Marine heatwaves of this magnitude typically cascade through food webs, affecting everything from kelp forests to fish populations that depend on cooler Pacific waters.

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