The Gulf of Maine Research Institute recently released its 2025 Gulf of Maine Temperature Report, which summarizes recent ocean temperature changes in the region through three perspectives: facts, drivers, and impacts.
Highlights from the Year
- In 2025, the Gulf of Maine experienced its 15th warmest sea surface temperature (SST) year on record (51.3°F; +0.74°F above normal).
- Bottom temperature (BT) ranked as the 11th coolest year on record (-0.38°F below normal), marking a notable surface-bottom contrast.
- Surface warming was strongest during late summer and early fall, with three marine heatwave events between July and October, while bottom temperatures remained relatively cool and did not reach extreme thresholds.
- Long-term trends continue to show rapid warming in the Gulf of Maine, nearly triple the global ocean average at the surface, with the strongest warming occurring during the stratified summer months.
The complete 2025 report is available on the Gulf of Maine Research Institute’s website: HERE