Lyon and Rhône Region Brace for ‘Hairdryer Effect’ Amid Intense Heatwave
Lyon, June 22, 2026 – An “intense and prolonged” heatwave continues to grip Lyon and the Rhône region this week. The department, already under an orange heatwave alert and potentially facing a red alert in the coming hours, is also set to be hit by the “hairdryer effect,” a highly unpleasant meteorological phenomenon combining extreme temperatures, strong winds, and a lack of rain, starting this Tuesday, June 23.
Mickaël Oquidan, a forecaster at Météo France’s Lyon-Bron center, told actu Lyon that several criteria for the Rhône and the Lyon metropolitan area are aligned for this Tuesday and again on Thursday. “We have extreme temperatures, there is the fact of having wind, especially for Tuesday with a north wind of 40 km/h and Thursday with a south wind,” the weather expert explained.
The Unpleasant Impact of Hot Winds
The “hairdryer effect” is caused by strong winds during an extreme heatwave. The only way to alleviate this unbearable and very humid sensation is to stay wet. “What we recommend is to keep the body wet. With a wet body, the effect of extreme heat will be attenuated, as if coming out of a shower or a swimming pool,” continued the Météo-France representative.
The forecaster also explained that this weather effect would be felt in urban agglomerations, such as the Lyon metropolis, on plains, and even on the higher massifs of the Rhône. “Minimum temperatures concern us and will continue to rise, ranging between 20 and 25°C. For 25°C, we find them in agglomerations but also on the heights of the Rhône. We are overheated everywhere,” warned Mickaël Oquidan.
Devastating Effect on Vegetation
The combination of heat, wind, and lack of water can also have a very rapid destructive effect on vegetation. “It is dried out, and this causes a real problem for it,” analyzed the meteorologist.
“Plants can then switch in a few hours from a state of moderate water stress to a critical situation, with massive leaf fall observable across entire landscapes, sometimes over tens of thousands of square kilometers,” described agroclimatologist Serge Zaka on X. “The consequences can be very rapid: massive leaf loss, mortality of particularly sensitive young plants, severe stress for wildlife and livestock, and an extreme to very extreme risk of fire.”
In France, one of the only documented cases of flash drought occurred in June 2019 in Hérault.
City’s Public Transport System Overheating
The ongoing heatwave has already led to a series of breakdowns in Lyon’s TCL bus network, highlighting the strain on public services. The extreme temperatures are causing equipment to overheat, leading to disruptions for commuters.
Preparing for the Heatwave
Authorities are urging residents to take precautions, including staying hydrated, avoiding strenuous activities during the hottest parts of the day, and seeking cool places. The city is also considering measures to mitigate the impact of the heatwave on vulnerable populations.
The “hairdryer effect” is expected to make conditions even more challenging, emphasizing the need for vigilance and adaptation strategies to cope with the escalating temperatures and their associated risks.
Source: actu.fr
