The surge in underwater warmth signals that the developing 2026–27 El Niño has officially reached Central California, fueled by weakened trade winds pushing warm water toward the Americas. Monitoring shows that typical nutrient cycling is failing, with equatorial Pacific chlorophyll levels dropping as nutrient-rich upwelling slows down. The reading of 64.72 degrees Fahrenheit at a depth of 200 feet shattered the prior historical record set during the 1997 El Niño event. Consequently, unusual southern and tropical wildlife species are rapidly displacing or mingling with local marine communities.
Key points
The unprecedented surge in coastal temperatures indicates that the developing 2026–27 El…: The unprecedented surge in coastal temperatures indicates that the developing 2026–27 El Niño is now actively impacting Central California.
Declining equatorial chlorophyll levels and suppressed upwelling are actively weakening t…: Declining equatorial chlorophyll levels and suppressed upwelling are actively weakening the regional phytoplankton biomass that sustains marine life.
Shifting thermal conditions have triggered a noticeable influx of southern and tropical w…: Shifting thermal conditions have triggered a noticeable influx of southern and tropical wildlife into the Monterey Bay marine ecosystem.
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Scientists monitoring the waters off California have recorded an unprecedented rise in ocean temperatures beneath Monterey Bay, with readings reaching 64.72 degrees Fahrenheit (18.18 degrees Celsius) at a depth of approximately 200 feet on October 26, 2026. The measurement surpassed the previous record set during the powerful 1997 El Niño event, marking the highest temperature recorded at that depth in nearly four decades of monitoring. The Monterey Bay Aquarium Research Institute (MBARI) announced the findings on October 29, while Phys dot org and Ocean News also reported on the unusual warming and its emerging effects on marine life. The temperature increase is among the clearest indications that the developing 2026-27 El Niño has reached Central California. Researchers have also begun spotting marine creatures normally associated with tropical and warmer southern waters, suggesting that the changing ocean conditions are already influencing the region’s underwater ecosystem.
A nearly 40-year record broken underwater
The measurements come from MBARI’s M1 mooring, a scientific monitoring station positioned in the middle of Monterey Bay, near the underwater Monterey Canyon. Its instruments have collected oceanographic and meteorological…
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