Signal interpretation
Current assessment
NOAA weekly Niño 3.4 SST is 29.60°C with an anomaly of +2.70°C.
Why it matters
Ocean heat stores energy and can affect atmospheric moisture, marine ecosystems and climate-driver development. It is kept separate from formal ENSO status.
Watch next
Watch weekly NOAA measurements and separately verified marine-heatwave, ocean-heat-content and ecosystem-impact evidence.