A long-haul winter under a historically strong El Niño
Calibrating a long-haul departure between November and February is not, this winter, a matter of comparing average temperatures. The bulletins published this autumn by NOAA's Climate Prediction Center describe an El Niño episode that is established and still strengthening: the Oceanic Niño Index stood at +1.80 °C for June-August 2026, far above the +0.5 °C threshold that defines the phenomenon. Forecasts give more than a 90% probability of a "very strong" El Niño through the heart of winter, and around 75% odds, over October-December, that it will exceed every episode measured since 1950. The event is expected to persist into spring 2027.
What the phenomenon actually shifts
El Niño does not make winter bad everywhere: it moves the rain. Some regions that are normally dry in season receive unusual rainfall, while others enter a drier-than-normal stretch. On a two- or three-week trip to the other side of the world, the difference rarely comes down to temperature — it comes down to how much water falls, which roads are cut, which crossings are cancelled and which domestic connections slip.
The habit to build
A destination's average climate — the figure comparison sites display — is a baseline, not a forecast. In a winter shaped by an episode of this intensity, it has to be cross-checked against the seasonal outlook published by national weather services and updated month by month. It is free, it is public, and it is what separates a well-calibrated departure from a trip spent rearranging the itinerary.
Read the rainfall map before picking the destination
Southeast Asia and the Indian Ocean
The most reliable signal of a strong El Niño concerns Indonesia and the Maritime Continent: drier-than-normal conditions from September to December, with a heightened risk of vegetation fires and smoke episodes affecting visibility and air quality. Conversely, parts of Southeast Asia, notably the Philippines, can see heavy rain and flooding: "El Niño means dry" is not a universal rule, it is a regional one.
Thailand keeps its cool season from November to February, still the most comfortable window of the year. Sri Lanka opens its southwest-coast dry season from December to March, with water around 28 °C. Oman shows winter averages of roughly 22 to 28 °C, and northern Vietnam a cooler range, around 18 to 23 °C.
The Americas and East Africa
The regional analysis published in June 2026 by the Pan American Health Organization expects excess rainfall along the coasts of Ecuador, northern Peru and northern Chile, peaking between the last quarter of 2026 and the first quarter of 2027 — on coastlines that are normally very dry, and therefore poorly equipped to absorb those volumes. At the same time, a drought risk is anticipated across parts of Central America, the Caribbean and northern South America, with possible strain on water and electricity. In East Africa, a very strong episode tends to reinforce the October-to-December rains.
The cyclone window belongs in the calendar, not in the surprises
Travelling to the southern hemisphere between November and February means travelling in cyclone season. In the southwest Indian Ocean, the 2026-2027 season runs from 15 November 2026 to 30 April 2027. The previous one counted eleven systems, above the basin's normal. Météo-France La Réunion publishes its seasonal cyclone activity outlook before the season opens: that is the source to check, rather than a historical average.
Turning the season into booking choices
- Changeable tickets rather than the lowest non-changeable fare, as soon as the trip touches the cyclone window.
- Cancellable accommodation for the first and last nights — the ones that collapse when a flight slips.
- Generous connections: three hours at a distant hub beats the eighty minutes billed as "sufficient".
- Insurance that covers trip interruption, not only cancellation before departure.
Paperwork: electronic authorisation is now the norm
At the destination
Since June 2025 Thailand has required an ETA from all visa-exempt travellers — some 93 nationalities, France among them — free of charge and to be requested online before departure on the official thaievisa.go.th portal; the visa exemption allows a 60-day stay, extendable locally. For the United States, ESTA rose to $40 on 30 September 2025, then to $40.27 on 1 January 2026 and to $40.62 from 16 October 2026. One rule applies everywhere: a passport valid for at least six months beyond the return date, and entry conditions checked on your foreign ministry's own site, not on a forum.
At the stopover and on the way home
A stopover does not exempt you from the stopover country's rules. The United Kingdom requires an ETA, transit included, whose fee went from £16 to £20 in late February 2026. On the return leg, the European Entry/Exit System (EES) has been fully operational since 10 April 2026: manual passport stamping has ended, and more than 52 million entries and exits have been recorded. The system applies to non-EU nationals — if you are travelling as a family with a non-EU family member, allow for biometric enrolment at the border, and for extra time in the schedule.
The countdown for a well-calibrated long-haul departure
At D-60: check every family passport's validity, apply for the electronic authorisations, read the destination's seasonal outlook and, if it is unfavourable, move the region rather than the dates. At D-30: a travel-health consultation for vaccines and malaria prophylaxis as the region requires, then book the domestic transport — the first thing rain disrupts. At D-7: save documents offline, confirm transfers, and check local bulletins one last time.
On the flight itself, cabin air is very dry: drinking water regularly changes how you arrive, and alcohol worsens dehydration while degrading sleep at altitude — best avoided. With children, shift meals to destination time from boarding onwards and aim for a late-afternoon arrival: the first night falls into place on its own, and the trip really begins the next morning.