Mexico is facing a period of intense heat associated with the 2025 heat wave: meteorological authorities have issued warnings for high temperatures that could exceed 40°C in specific areas. Health and labor institutions recommend concrete measures to reduce risks and protect vulnerable groups.
What is the dog days and why does it matter now?
The dog days are a seasonal period in which temperatures remain high for days or weeks, increasing health risks and straining infrastructure. For 2025, Conagua and the National Meteorological Service have identified windows of intense heat in some regions that require preventive attention.
Most affected areas and magnitude of the heat
warnings and media coverage identify the north, northeast, and several central areas as the most exposed to temperature spikes. In extreme episodes, some locations have recorded highs near or exceeding 40°C and even reported peak temperatures of up to 45°C in recent periods, increasing the risk of heat exhaustion and heat stress.
Health Impact: What You Should Know
Extreme heat increases the incidence of heat exhaustion, dehydration, and heatstroke, conditions that are worse in children, older adults, and people with chronic illnesses. Warning signs include confusion, loss of consciousness, rapid pulse, and very hot skin; if these occur, lower temperature and seek immediate medical attention.
Practical recommendations for the population
institutions recommend staying hydrated frequently, avoiding sun exposure during peak hours, wearing lightweight, light-colored clothing, and maintaining cross-ventilation in your home. Avoid leaving people or animals in closed vehicles, and if working outdoors, plan breaks in the shade and access to fresh water.
Measures for employers and workers
Companies and workshops should adapt shifts and breaks, provide drinking water and cool rest areas, and avoid strenuous physical work during peak hours. Authorities' recommendations include regular breaks and rescheduling work when conditions warrant.
Municipal preparedness and public services
Local governments can activate cool shelters, distribute risk maps by neighborhood, and open community centers with water and shade for those without access to refrigeration. Coordination between Health, Civil Protection, and urban services is key to mitigating impacts.
Climate context and why this is repeated
Thermal extremes are linked to atmospheric patterns and, in the medium term, to global warming, which increases the frequency and intensity of heat waves. This combination explains why we are seeing earlier and more severe peaks than in past decades.
Sources and where to get information
Please consult official advisories from the National Meteorological Service and the National Water Commission for updated dates and maps; also review recommendations from the Mexican Social Security Institute (IMSS) and local Civil Protection for health and emergency protocols.
Check local advisories from the National Health Ministry (SMN) and Conagua (Conagua) before planning outdoor activities; if you're an employer, adjust schedules and protective measures to avoid workplace accidents due to heat.
