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France sees mosquito resurgence due to mild September weather
Mosquito activity is increasing in France during September due to recent rainfall and mild temperatures exceeding 20°C. This resurgence follows a summer period where extreme heat and drought hindered mosquito reproduction and increased adult mortality.
Experts note that the tiger mosquito (Aedes albopictus) is particularly resilient, with eggs capable of surviving dry conditions and low temperatures for months. The species has expanded significantly in France, being present in 81 departments as of 2025, and is permanently established in 30 of the 45 European countries.
Health monitoring by Santé publique France reported 13 local transmission cases of chikungunya and four cases of dengue in mainland France as of mid-September 2026. While these figures are lower than the 65 clusters recorded during the same period in 2025, the current weather conditions are driving a renewed demand for insect repellents.
Entities
European Centre for Disease Prevention and Control · France · Institut Pasteur · La Chaîne Météo · Santé publique France
Claims
What the coverage asserts, and how many sources carry each claim.
- [● 2 SOURCES] As of September 14, 2026, France recorded 13 cases of local chikungunya transmission and four cases of dengue. www.lalsace.fr · www.vosgesmatin.fr
- [○ 1 SOURCE] The tiger mosquito has expanded to 81 departments in France as of 2025. www.medisite.fr
- [● 2 SOURCES] Tiger mosquito development is optimal at temperatures between 20 and 35 °C. www.lalsace.fr · www.vosgesmatin.fr
- [● 3 SOURCES] Recent rains and mild temperatures have led to increased mosquito activity after summer heat and drought slowed them down. www.lalsace.fr · www.medisite.fr · www.vosgesmatin.fr
- [○ 1 SOURCE] Intense heatwaves cause high mortality rates in adult mosquitoes because they cannot regulate their internal temperature. www.medisite.fr
- [○ 1 SOURCE] The tiger mosquito is permanently established in 30 out of 45 European countries. www.medisite.fr