According to data, warming is increasing in the Basque Country
On the street it is often heard that the current summer seasons are warmer than before. The data confirm this too. The average temperature of that time has risen in the 21st century and, looking at the 20th century, the difference is noticeable.
"We are too hot!" We have often said and heard this statement this summer, especially in mid-August. Given the extreme heat we have experienced for many days, EITB has collected temperature data in its EITB Data report published this Monday.
The upward trend in temperatures detected in recent years has been confirmed in the summer of this 2025 in both the Basque Autonomous Community and Navarre.
The average summer temperature in the Basque Country this year has been 21 degrees and is very close to the historic majority that was measured in 2003 (then 21.5 ° C). In addition, as can be seen from the graph above, from 2015 onwards, the predominance of reddish colors, instead of the blue of the 20th century.
The same is true in Navarre, where an average temperature of 23 ° C has been recorded in summer. The historic majority was measured in 2022, with 23.8 degrees.
EVOLUTION OF TEMPERATURES IN NAVARRE
This year the heat has been extreme in many regions and towns, especially during the first 20 days of August. The 15th of that month was a critical day. Many weather stations measured heat levels above 40 degrees Celsius.
July, however, was an oasis between the warmth of late June and August.
Longer and longer summers
In addition to high temperatures, there has been an increase in extreme heat days and very hot days. Summer can be said to have been prolonged, because high temperatures are now between June and October.
AVERAGE TEMPERATURE PER DAY AND COMMUNITY (2022-2025)
This environmental warming is taking place not only on Earth, but also at sea. The data collected show that sea water temperatures have risen on average every month, increasing in the summer months.
Around the buoy at the port of Bilbao, water has warmed up 2 degrees in July over the last 10 years.
SEA TEMPERATURE
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