France experienced its hottest night ever recorded on the night of Monday, June 22, to Tuesday, June 23, 2026 [1].
This record indicates a significant shift in nocturnal temperature patterns, suggesting that heat waves are preventing the country from cooling down overnight. This lack of nocturnal relief increases health risks for vulnerable populations and strains energy infrastructure.
Météo-France said that the national minimum-temperature indicator, known as the ITN, reached 21.6°C [1]. This figure surpasses the previous record of 21.4°C, which was set on July 25, 2019 [1]. The national indicator provides a weighted average of temperatures across the country to determine overall thermal trends.
The record-breaking night followed a day of extreme heat. On Monday, June 22, the national daytime temperature indicator reached 29.2°C [3]. This surge is part of an ongoing heat wave, or canicule, that has pushed temperatures to unprecedented levels across the region [2].
In response to the extreme conditions, French authorities increased alert levels. By Tuesday, 16 departments were placed under red vigilance [2]. This highest level of alert is used to trigger emergency protocols, and public health warnings to mitigate the impact of the heat.
The combination of record-breaking daytime highs and the hottest night in history since the national minimum-temperature indicator began in 1947 marks a critical weather event for the country [1]. Meteorologists continue to monitor the system as the heat wave persists across several regions [2].
“The night of 22–23 June 2026 was the hottest night ever recorded in France.”
The breaking of a record set during the extreme summer of 2019—specifically during the night—highlights the phenomenon of 'tropical nights' becoming more frequent in Western Europe. When minimum temperatures fail to drop, the human body cannot recover from daytime heat stress, which typically leads to higher mortality rates and increased demand for cooling systems during peak energy hours.
