Harvard's Global Support Services is sounding the alarm that extreme weather and natural disasters are no longer occasional background concerns but central factors in planning international travel. Weather events ranging from crippling heat waves to hurricanes and floods are occurring with greater frequency and intensity across the globe, and are far more likely to derail overseas research trips, conferences and fieldwork than in the past. These disruptions are not limited to delays and cancellations; climate change is increasing the intensity, severity and unpredictability of such events, with secondary effects that include worsening air quality, respiratory illnesses, diseases, water scarcity, food insecurity and social unrest.
The advisory describes how these changing global weather patterns are already reshaping the lived reality of academic travel. A research trip to a coastal facility can be abruptly derailed by a hurricane, an international conference in a major capital may struggle through a severe heatwave, and thesis interviews can be postponed when floods cut off transportation links. One of the most frequently issued alerts from International SOS now concerns natural hazards, including extreme weather, and Harvard's security partners have explicitly flagged climate change as a major travel risk in the coming years. Against that backdrop, the university is urging individual travelers and organizers of international programs to adopt practical strategies that recognize weather as a critical operational risk, not just a minor inconvenience.
Extreme heat is singled out as a rising threat that many travelers will confront directly. Just as occasional heat waves and poor air quality already affect parts of the northeastern United States, similar conditions are increasingly likely to coincide with trips abroad. The guidance notes that while it is impossible to fully avoid heatwaves or air pollution, travelers can meaningfully reduce their exposure by researching a destination's air quality index, monitoring local forecasts and, when possible, scheduling trips for periods with milder temperatures and better air quality. Those with asthma, heart conditions, older travelers and families traveling with children are advised to consult a doctor in advance, underscoring that what once might have been dismissed as uncomfortable weather now carries real health implications.
The recommendations become highly concrete when addressing what to do if high heat and poor air quality are encountered on the ground. Travelers are urged to stay hydrated with plenty of water and, when necessary, oral rehydration solutions to replace electrolytes, while limiting alcohol and caffeinated drinks that contribute to dehydration. Wearing lightweight, loose-fitting clothing in breathable fabrics, prioritizing indoor activities, and minimizing strenuous outdoor exercise during afternoon and early evening hours, when temperatures and air pollution typically peak, are highlighted as simple but effective steps. Indoors, closing curtains and blinds on south-facing windows, taking cool showers or baths, using fans strategically and sleeping with breathable cotton sheets can make accommodations more tolerable. For those staying in places where air quality is a persistent concern, investing in a portable air purifier for hotel rooms or workspaces and considering a high-quality mask such as an N95 respirator when venturing outside are presented as practical tools for reducing exposure to harmful particles.
The health risks associated with extreme heat extend beyond discomfort, and the advisory urges travelers to pay close attention to their bodies. High temperatures can exacerbate existing heart and lung conditions and lead to heat-related illnesses including heat cramps, heat exhaustion and heat stroke. Symptoms such as dizziness, nausea, muscle cramping, headaches or difficulty breathing are described as warning signs that require immediate action, starting with seeking cool shelter and escalating to medical attention if necessary. At the same time, the guidance notes that extreme heat can overload local electricity systems and lead to power reductions or outages, some of which may be pre-scheduled as "brownouts" or "rolling blackouts" to protect the grid. Travelers are encouraged to factor the availability of backup generators into their lodging choices, track updates from local energy providers, keep devices charged and have flashlights ready, while planning for meal preparation, safe drinking water and the disposal of food that may spoil during outages.
Beyond heat, the Harvard guidance paints natural disasters as a broad and often sudden category of risk that encompasses earthquakes, tsunamis, volcanic eruptions, tornadoes, wildfires and floods. These events are described as frequently unforeseen, with little advance warning, and traveling to locations at high risk demands extensive research, planning and preparation. A Harvard undergraduate quoted in the material stresses the value of readiness, noting that no one expects an earthquake to happen to them, but that knowing how to handle such situations and what resources are available can significantly reduce stress once a disaster occurs. This emphasis on preparedness is underlined by references to educational resources and a video designed to help travelers begin the process of understanding the hazard profile of their destinations.
Hurricanes, cyclones, typhoons and other tropical storms receive particular attention as examples of weather that is both destructive and, compared with many other hazards, more predictable. These storms can cause significant damage to infrastructure and become direct threats to human life, but they are generally tracked by meteorologists, allowing their potential impact on local populations to be anticipated. The advisory encourages travelers to research destinations before departure to understand infrastructure capabilities, the capacity of emergency services and which seasons present the greatest storm risk, rather than assuming that a booking alone guarantees safety. Registering trips with International SOS to receive alerts about dangerous weather is framed as a key step in staying ahead of developing storms while in-country, complementing local information sources and official warnings.
Woven through the guidance is a call for a more professional, risk-aware approach to international travel that reflects the new climate reality. Harvard GSS positions its advice not as an attempt to deter people from going abroad, but to ensure they do so with a clear-eyed understanding of how extreme weather and natural disasters can intersect with academic aims. By treating heatwaves, storms and other hazards as operational issues that require contingency planning—covering everything from air quality and power reliability to evacuation support—the university argues that travelers can better protect their health and safety while maintaining the continuity of research and teaching overseas. The message is that being informed, having a plan and knowing where to turn for assistance are now essential components of traveling internationally in an era marked by increasingly volatile weather.