The summer of 2026 has officially broken temperature records in the Netherlands, becoming the warmest season since nationwide measurements began in 1901.
Average daytime temperatures measured in De Bilt reached 19.3 degrees Celsius over the past three months, surpassing the previous record of 18.9 degrees set in 2018.
The season brought the highest number of days above 35 degrees on record, alongside a record total of tropical days that began earlier than usual in June.
Record daytime and nighttime temperatures
Nighttime temperatures were notably high across the country throughout the summer months.
Maastricht recorded three consecutive nights where temperatures did not drop below 22 degrees Celsius, marking the first time that has occurred.
Climate experts at the national meteorological institute KNMI calculate that such summers currently carry an estimated return period of five years.
Longer-term outlook and wetter autumns
Under high-warming climate projections, conditions seen in 2026 are expected to become an average Dutch summer around 2050.
Unusually warm sea temperatures are also expected to contribute to heavier rainfall in the coming months, aligning with a broader trend toward warmer and wetter Dutch autumns.
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