Indices
Daily mean sea surface temperature between 60S and 60N from Copernicus Climate Pulse, and its difference from 1991-2020.
Limits. Last 2-3 days preliminary. Not the same dataset as the OISST world SST series.
How to read it
degC; around 21.0 degC and +0.7 in late September 2026.
Why it matters for Koh Samui
Ocean heat drives air temperature and coral bleaching risk; El Nino raises it.
ENSO status now
- ONI (NOAA CPC)
- +1.80 °C, JJA 2026 (previous +1.39 °C)
- RONI (NOAA CPC)
- +1.36 °C, JJA 2026
- Nino 3.4 weekly (NOAA CPC / OISST)
- +3.0 °C anomaly, week of 16 Sep 2026 (SST 29.6 °C)