The Portuguese Institute for Sea and Atmosphere (Instituto Português do Mar e da Atmosfera or IPMA) has issued Yellow Heat Warnings for nine mainland districts, including Lisbon, Porto, and Coimbra, effective from September 19 to 21, 2026. Temperatures are expected to reach 38°C due to an anticyclone, prompting officials to warn of increased rural fire risks and public health concerns.
Yellow heat warnings issued for nine mainland districts
Friday, 18 September 2026AI summary
Context & Explainers
A red warning is the highest alert level issued by Portugal's weather agency, the Portuguese Institute for the Sea and the Atmosphere (Instituto Português do Mar e da Atmosfera or IPMA), used when conditions pose a very high risk to life and property. Under a red warning authorities may close roads, suspend transport and advise people to avoid coastal and flood‑prone areas, so follow civil protection instructions during the Friday–Saturday storm period.
4 sources
- IPMA warning: Very high to maximum rural fire danger in the North, Centre, Alto Alentejo, and Algarvertp.pt ·
- Temperatures rise again in Portugal: 'Heat also kills'Now Canal ·
- Heatwave marks the start of autumn with temperatures of 38°Ccmjornal.pt ·
- Portugal Heat Wave Warning September 2026: Porto, Lisbon Guidenomadlawyer.org ·
