OCEAN · SEA TEMPERATURE ANOMALY

Sea Temperature Anomaly

Not how warm the sea is, but how far from normal — a live map of how many degrees Celsius warmer or cooler the sea surface is than its own long-term average for the date. Blue is cooler than normal, red is warmer; the warm reds are where marine heatwaves build and the broad equatorial-Pacific stripe is the signature of El Niño or La Niña. The anomaly strips away the seasons and latitudes to show what is genuinely unusual — the number climate and fisheries scientists actually track. Updated daily from a global 5 km satellite product.