Extreme Temperature Diary Tuesday June 30th, 2026/Main Topic: CAT5 Heatwave Ember Causes Political Fallout in Germany

An unprecedented heatwave for June has set all-time heat records at 9 European nations or territories, and we expect a renewed resurgence early next week. For the rest of this week, it's the United States' turn to roast in a mega heat wave. @bhensonweather.bsky.social and I have the details:

Dr. Jeff Masters (@drjeffmasters.bsky.social) 2026-06-29T19:50:47.812Z

Germany’s heatwave has a political fallout

This last weekend saw recording-breaking temperatures exceeding 40 degrees Celsius (just over 107 degrees Fahrenheit), with limited opportunities to cool down at night and water shortages. These are life-threatening situations for retirement and nursing homes and hospitals with little or no air conditioning.

One reason for this is that Germany doesn’t have any national heat protection regulations that would require cooling systems in such facilities.

Infrastructure was also affected, with trains and trams unable to function and the asphalt on many roads cracking.

Experts have been issuing warnings for a long time. Speaking on Deutschlandfunk Radio (DLF), Andreas Becker, a climate expert at the German Weather Service, said that temperatures in Germany are rising steadily and will continue to do so in the coming years.

Europe hit hardest by global warming

According to the Federal Environment Agency, around 50 hectares of land were turned into residential, transportation and commercial areas in Germany every single day between 2021 and 2024. In other words: Every day in Germany, 70 soccer fields’ worth of natural areas disappeared.

Sealing soil prevents rainwater from seeping into the ground, leading to severe flooding during heavy rainfall. In addition, sealed surfaces can no longer allow water to evaporate, causing cities to heat up excessively and creating dangerously hot urban areas.

So, what can policymakers do to ensure the country is better prepared for extreme temperatures in the future?

Plans for cities already exist, but implementing them takes time and is expensive. Environment Minister Carsten Schneider from Germany’s center-left Social Democratic Party (SPD) said Monday on public broadcaster ARD that he does not believe it is up to the federal government in Berlin to lead the way in adapting to climate change. “The responsibility lies with the federal states and municipalities,” he said. “For example, I cannot even provide financial support because Germany’s Basic Law prohibits me from doing so.”

The environment minister did promise to discuss with his conservative coalition partners the possibility of amending the Basic Law so that the federal government could take a more active role in implementing such changes. But he added that states and municipalities do have around €100 billion ($114 billion) available for climate projects thanks to the €500 billion infrastructure program approved after last year’s federal election.

Climate Council: Germany set to miss its own climate targets

Greenhouse gases are primarily generated by burning fossil fuels. They act as an insulating blanket around Earth, causing global temperatures to rise.

Germany is committed to cutting its greenhouse gas emissions by about 65% by 2030, as measured against 1990 levels and has already achieved 48% of that goal. But many experts do not believe the government can meet its promised target.

Even with a strong climate policy, the effects of the greenhouse effect are expected to intensify in Germany over the next few years, as these are a consequence of CO2 emissions from previous years.

The current government, led by Chancellor Friedrich Merz of the conservative Christian Democratic Union (CDU), however, is once again allowing the installation of new oil and gas heating systems.

Greenpeace proposes an ecological tax on billionaires

Martin Kaiser, the Head of International Climate Politics at Greenpeace Germany, told DW, “Many municipalities are already heavily in debt, meaning the special fund alone is insufficient, for example, to quickly eliminate heat-absorbing concrete surfaces, create water-retaining green spaces, or plant shade-providing trees. Such measures require long-term public support and investment and cannot be financed by one-time investments alone.”

Greenpeace has proposed an environmental tax on billionaires as a solution; however, there does not currently appear to be enough support for this within the governing coalition.

Germany’s opposition parties have been quick to criticize the government. The chair of the socialist Left Party, Ines Schwerdtner, said that more needs to be invested in public transport — especially in cities — so that buses and trains can operate safely even during extreme heat.

Green Party leader Felix Banaszak called for providing direct support — without red tape — to particularly vulnerable facilities such as retirement and nursing homes. Banaszak also commented on the government’s failure to issue a statement during the heat wave: “One gets the feeling that Friedrich Merz and his government have agreed to keep quiet on the issue and were simply hoping to avoid having to say anything about the situation until it rains again,” he told reporters.

Climate protection has lost much of its urgency

What’s more, most Germans don’t seem as concerned about climate protection as they once were. In a nationwide survey published in early June by the polling institute infratest-Dimap, only about 10% of respondents said that environmental protection and climate change were the most important or second-most important issues for them. Instead, issues such as the economic downturn and immigration topped the list.

That said, the survey was conducted before Germany experienced its hottest heat wave to date.

This article was translated from German.

🥵 450 record hot temperatures in jeopardy through Sunday! 150 record highs up to 107°!300 record warm mornings with some lows staying above 80° in the big cities of the East. Going to be a brutal stretch!! #heatwave #4thofJuly #heat

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-30T22:55:12.652Z

106° is the National Blend of Models high temp forecast for Baltimore on Friday. Not unprecedented, but rare. The all-time high is 107°. 106 is about a once every two decade event in a climate with an avg like that of the last 30 years. #heatwave

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-30T15:10:29.551Z

Cities like Hartford and DC even have a shot of reaching their all-time records. Isolated 106-107. Feels like temps 105-115°. Hottest day for most will be Friday and the heat eases a little this weekend. Be safe everyone! #heatwave

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-30T12:27:45.967Z

Supercharged Heat Domes are appearing all around the Planet! Why? It’s a developing super El Niño combined with a much warmer Earth, spiking natural cycles with extra heat injected into the system and pattern changes manipulating the jet stream…1/

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-29T13:36:30.123Z

New study: the European heat wave would rank as the 7th deadliest in world history, using numbers from EM-DAT for historical events, as I detailed yesterday: yaleclimateconnections.org/2026/06/east…Callahan’s study is only for the 7 days ending Jun 28, and extreme heat also occurred Jun 29-30.

Dr. Jeff Masters (@drjeffmasters.bsky.social) 2026-06-30T21:46:24.671Z

Paris funeral homes overwhelmed after record heatwave

Matt Novak (@paleofuture.bsky.social) 2026-06-29T18:11:29.369Z

Last week’s deadly heatwave in Europe and this week in the US highlight that worsening summer heat is becoming a shared global experience. While heatwaves made worse due to climate change affect us all, heat’s dangers are felt unequally — and outdoor workers are particularly vulnerable.

Covering Climate Now (@coveringclimatenow.org) 2026-07-01T00:11:00.525Z

"Rethinking Extreme Heat and Urban Resilience through Scales Connectivity" | Commentary for @upenn.edu @kleinmanenergy.bsky.social led by our colleague @xuekeli.bsky.social (now at City U of Hong Kong): kleinmanenergy.upenn.edu/research/pub…

Michael E. Mann (@michaelemann.bsky.social) 2026-06-30T06:59:40.249Z

From last week's record heat wave in Europe to the coming Semiquincentennial heat wave in the Eastern U.S. — I'll be discussing live with @jimacosta.bsky.social on the #JimAcostaShow, Thursday July 2 in the 4pm ET hour: jimacosta.substack.com

Michael E. Mann (@michaelemann.bsky.social) 2026-06-30T12:28:47.195Z

Heatwaves could ruin your pension'Climate change is becoming a major risk for trillions of pounds in pension savings as increasingly unpredictable weather damages assets, disrupts supply chains and hits productivity, according to a report by the Society of Pension Professionals (SPP).'

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-06-30T11:27:34.932Z

We're at 0.53C global SST anomaly. Quite a ways to go to beat the 0.72C January 2023 record, will be interesting to watch the trajectory as the current El Niño episode continues to build:

Michael E. Mann (@michaelemann.bsky.social) 2026-06-30T12:46:10.429Z

Latest "plume" of El Niño forecasts, via @climate.columbia.edu. Consensus dynamical forecast now maxes out at Nino3.4 ~2.6C (very strong event), while statistical forecasts are pointing toward ~2C (strong event)iri.columbia.edu/our-expertis…

Michael E. Mann (@michaelemann.bsky.social) 2026-06-29T14:42:50.147Z

US data centers for AI tend to run on more fossil fuels than renewables → they produce proportionally more climate pollution → which is supersizing extreme weather → which is now the #1 risk to data centers themselves. The very definition of "coming right back around to bite you."

Katharine Hayhoe (@katharinehayhoe.com) 2026-06-30T16:53:05.419Z

For more on AI and climate — the good, the bad, and the ugly — I do a deep dive in my Talking Climate newsletter here ⬇️

Katharine Hayhoe (@katharinehayhoe.com) 2026-06-30T17:21:40.747Z

Lemmings voting for Christmas.www.reuters.com/sustainabili…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-06-30T11:09:03.206Z

Architect of Project 2025: thebulletin.org/2024/08/proj…

Michael E. Mann (@michaelemann.bsky.social) 2026-06-30T14:54:01.448Z

This is my favorite climate change chart. Japanese monks, aristocrats, and emperors kept meticulous records of cherry blossom festivals for 1,200 years and accidentally built the world's longest climate dataset.

John Bistline (@bistline.bsky.social) 2026-04-01T14:23:07.012Z

Huge #heatwave grips the East Coast. It’s just one of multiple historic heatwaves popping up around the planet! So what is contributing to this in the US and #Europe? It’s part emerging super #elnino piled on top of a much warmer Earth! Here’s how it all comes together… #climate #climatechange

Jeff Berardelli (@weatherprof.bsky.social) 2026-06-30T13:07:29.037Z

Wildfire activity ramped up in northern Canada over the past 4 days, resulting in the 1st significant incursion of Canadian wildfire smoke into the U.S. this year, into Montana and North Dakota. Plenty of smoke in the Rockies from U.S. fires, too.

Dr. Jeff Masters (@drjeffmasters.bsky.social) 2026-06-30T21:53:38.538Z

The wildfire situation in the Southern Rockies continues to escalate. A new and fast-moving wind-driven fire today southwest of Pueblo, CO (#AspenAcresFire, near Beulah, circled in yellow) is of particular concern, and is currently burning through populated areas. #COwx

Daniel Swain (@weatherwest.bsky.social) 2026-06-29T21:51:32.000Z

So far, EDF's discussion in France is building cooling towers for EPR2 – yet significant loss via evaporation. Cooling towers need water for evaporation (either from the river or from groundwater). Direction of travel seems clear.reneweconomy.com.au/nuclear-reac…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-06-30T11:25:28.015Z

I have to say, what a cool project this would be …

Katharine Hayhoe (@katharinehayhoe.com) 2026-06-30T21:30:42.193Z

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