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- Unit
- September sea ice extent · million km²
- Period
- 1979–2026
- Source
- NOAA/NSIDC Sea Ice Index v4, monthly September mean sea ice extent, accessed 31 October 2026. September is late summer in the Arctic and late winter in Antarctica; values are monthly averages, not daily extremes. Extent is the ocean area in grid cells with at least 15% ice concentration. Satellites and processing sources change in 2025. Animation interpolates between annual September observations.
- License
- Fetterer et al. (2025), Sea Ice Index, Version 4, NSIDC. NASA Earth Observatory / NSIDC maps show daily 2026 extrema; Antarctic sea ice background photograph by NASA/Jeremy Harbeck, October 2018, illustrative iceberg. No endorsement implied.