Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Topic: Ocean heat

Photo showing Bright sunlight with sunbeams under blue water surface in the sea with some small fish.

Record-warm ocean temps fueled longest-lasting U.S. heatwave in 2023

July 18, 2025

Focus areas:

Topics:

Photo showing Bright sunlight with sunbeams under blue water surface in the sea with some small fish.

Scientists deploy a Deep Argo float in 2018 from Research Vessel Kaʻimikai-O-Kanaloa at the Pacific Ocean off Hawaii. The ocean robot will track ocean temperature, salinity and other data down to 3 to 4 miles deep in the ocean.

Data from robots shows steady increase in deep-ocean warming

September 20, 2024

Focus areas:

Topics:

Scientists deploy a Deep Argo float in 2018 from Research Vessel Kaʻimikai-O-Kanaloa at the Pacific Ocean off Hawaii. The ocean robot will track ocean temperature, salinity and other data down to 3 to 4 miles deep in the ocean.

MARILAO, PHILIPPINES - MAY 04, 2024: Workers prepare to dump blocks of ice at a pool amid extreme heat in Marilao, Bulacan province. Sweltering conditions strained power grids, sparked health warnings, and left residents desperate for ways to stay cool. May 2024 was the world's warmest May on record.

May 2024 was Earth’s warmest May on record

June 13, 2024

Focus areas:

Topics:

monthly climate report

MARILAO, PHILIPPINES - MAY 04, 2024: Workers prepare to dump blocks of ice at a pool amid extreme heat in Marilao, Bulacan province. Sweltering conditions strained power grids, sparked health warnings, and left residents desperate for ways to stay cool. May 2024 was the world's warmest May on record.

October 4, 2023: An aerial view of the drought-hit harbor of Cacau Pirêra, where houses that normally float on the water are lying on the river bed in Iranduba, Amazonas, Brazil. October 2023 was the world’s — and South America’s — warmest October on record.

The planet just had its warmest October on record

November 15, 2023

Focus areas:

Topics:

monthly climate report

October 4, 2023: An aerial view of the drought-hit harbor of Cacau Pirêra, where houses that normally float on the water are lying on the river bed in Iranduba, Amazonas, Brazil. October 2023 was the world’s — and South America’s — warmest October on record.

HUARINA, BOLIVIA – SEPTEMBER 29, 2023: An aerial view of a boat stuck in the dried lake bed of Lake Titicaca. The water level of Titicaca, the largest lake in South America, has been dropping drastically due to the unprecedented winter heat that hit the country. September 2023 was the warmest September on record for South America and the globe.

Topping the charts: September 2023 was Earth’s warmest September in 174-year record

October 13, 2023

Focus areas:

Topics:

monthly climate report

HUARINA, BOLIVIA – SEPTEMBER 29, 2023: An aerial view of a boat stuck in the dried lake bed of Lake Titicaca. The water level of Titicaca, the largest lake in South America, has been dropping drastically due to the unprecedented winter heat that hit the country. September 2023 was the warmest September on record for South America and the globe.

SEVILLE, SPAIN - AUGUST 21: A person walks past a place of business cooled by water vapor during a heatwave on August 21, 2023. The city — the hottest major metropolitan area in continental Europe — baked under Europe’s second-warmest August and third-warmest summer on record.

The world just sweltered through its hottest August on record

September 14, 2023

Focus areas:

Topics:

monthly climate report

SEVILLE, SPAIN - AUGUST 21: A person walks past a place of business cooled by water vapor during a heatwave on August 21, 2023. The city — the hottest major metropolitan area in continental Europe — baked under Europe’s second-warmest August and third-warmest summer on record.

Children playing in a water fountain during a heat wave on July 24, 2023, in Hong Kong, China. Asia, Africa and South America all sweltered through their hottest Julys on record last month.

Record shattering: Earth had its hottest July in 174 years

August 14, 2023

Focus areas:

Topics:

monthly climate report

Children playing in a water fountain during a heat wave on July 24, 2023, in Hong Kong, China. Asia, Africa and South America all sweltered through their hottest Julys on record last month.

Extensive bleaching of the soft coral Palythoa caribaeorum on Emerald Reef, Key Biscayne, Florida. Date unknown.

The ongoing marine heat waves in U.S. waters, explained

July 14, 2023

Focus areas:

Topics:

marine heat waves

Extensive bleaching of the soft coral Palythoa caribaeorum on Emerald Reef, Key Biscayne, Florida. Date unknown.

Colorful corals under the water surface.

Rising ocean temperatures raise new concerns for coral reefs

July 13, 2023

Focus areas:

Topics:

marine heat waves

climate impacts

Colorful corals under the water surface.

Subscribe to ocean heat