Niño-3.4 SST anomaly · weekly
Observation period: · observed basis
Weekly ocean-temperature context. This is not RONI or an official ENSO phase declaration. Source
Climate, energy and security
Current conditions, observed change and conditional projections — with their periods and baselines.
Observation period: · observed basis
Weekly ocean-temperature context. This is not RONI or an official ENSO phase declaration. Source
Observation period: · observed basis
Monthly HadISST-based index from NOAA PSL; publication can lag by several months. Source
Indices describe ocean conditions. Their signs do not indicate benefit or harm, and do not establish the cause of an event.
Observed change · Global
Anomaly from 1995–2014 · °C
+0.40 °C per decade over 1996–2025.
ERA5 reanalysis combines observations with a physical model. Published coverage may be incomplete.Looking ahead · Conditional projection
+1.00 °C mean change from 2015–2034
No defensible member range is available for this view; uncertainty has not disappeared. The selected pathway is conditional, not a forecast. Observations and projections retain their own baselines.Changing heat and rainfall can alter water availability, food production, energy demand and infrastructure stress. Consequences depend on local exposure, resilience and cross-border connections.
Explore climate context on the map →Only reviewed public climate products appear here. Copied tail values and incomplete years are excluded. Annual anomalies use the stated baseline; absolute model projections are differenced within the same model series, never against ERA5 levels.
Published 2026-09-30. Regional and global lines are area-weighted means of the published country products over land, on the same jurisdiction polygons the products were cut from. They carry no member range: a region's 10th percentile is not the mean of its countries' 10th percentiles, and a combined range needs a regional product from the aggregator. Jurisdictions the geometry excludes (Antarctica) are in no aggregate.
Read product provenance and download reviewed measurements →