As temperatures soar across Vietnam, meteorologists are sounding alarms over the increasingly frequent heat waves that have become characteristic of the changing climate. On April 20, 2025, the Hydrometeorological Agency is predicting scorching temperatures in the northern mountainous and midland regions, with highs expected to range from 35 to 37 degrees Celsius, and in some areas even exceeding 38 degrees Celsius. This trend is not isolated; experts are drawing comparisons to historical data, indicating a significant uptick in extreme weather events.
Meteorologist Dominik Jung from wetter.net emphasizes that while isolated hot days in April have occurred in the past, they are now more prevalent and widespread. “Individual hot days in April have always happened, that’s correct,” Jung noted. “But the key point is: Today such extremes occur more frequently and broadly than before. It’s no longer a coincidence but a trend.”
This trend is underscored by historical records, such as the 31 degrees Celsius recorded in Jena on April 17, 1934, and the 32.9 degrees Celsius seen in Bad Mergentheim on April 28, 2012. Jung points out that while these instances were notable, they do not reflect the current reality where such temperatures are becoming routine.
The distinction between weather and climate plays a crucial role in understanding these phenomena. Weather refers to the day-to-day conditions we experience—sunshine, rain, wind, and temperature—while climate is defined as the average weather conditions over a period of at least 30 years. Jung highlights that the increasing frequency of record-breaking heat days, particularly at a time of year traditionally associated with milder temperatures, signals a clear message from climate science: the planet is warming.
As temperatures climb, the implications for the environment and public health are serious. The temperature curve has shown a steady upward trend over decades, leading to earlier heat waves each year. This shift is affecting vegetation patterns, causing allergies to manifest sooner, and increasing the risk of forest fires during spring. Jung warns, “The statement ‘It used to be like this too’ may apply to individual record days, but it overlooks the larger trend.”
In Vietnam, the forecast for April 20 indicates that the heat will not be confined to the north. The central highlands and southern regions are also bracing for high temperatures, typically between 35 and 36 degrees Celsius, with some areas likely to exceed this range. The relative humidity is expected to hover between 55 and 60 percent, contributing to the discomfort.
Weather forecasts show that Hanoi will experience a mix of cloudiness and sunshine, with localized heat and possible thunderstorms in the evening. Temperatures are expected to reach a high of 33 to 35 degrees Celsius, with some areas surpassing 35 degrees. The forecast warns of severe thunderstorms that may include tornadoes, lightning, hail, and strong winds.
In the Northwest region, similar conditions are anticipated, with temperatures ranging from 34 to 37 degrees Celsius, and localized extreme heat in certain areas. The forecast also indicates that thunderstorms may develop, potentially bringing dangerous weather conditions.
As the heat wave continues, the northern delta region will also experience high temperatures, with predictions of highs above 35 degrees Celsius. The weather will remain hot and humid, with the lowest relative humidity between 50 and 55 percent.
Looking ahead, the heat warning in northern Vietnam is expected to last until approximately April 22, 2025. However, the heat in the areas from Thanh Hoa to Phu Yen may gradually decrease after April 23 or 24, while the central highlands and southern regions will likely continue to experience elevated temperatures for several more days.
The implications of these rising temperatures extend beyond discomfort. As Jung notes, the increasing frequency of hot days has broader environmental consequences. “Such developments are clear signs of global warming,” he stated, emphasizing that while individual warm April days have occurred historically, they are now happening with greater frequency and intensity.
In summary, the current weather patterns serve as a stark reminder of the ongoing climate crisis. The frequency of extreme weather events is increasing, and as temperatures rise, the risks to public health and the environment become more pronounced. With the forecast predicting continued heat across Vietnam, it is crucial for communities to prepare and adapt to these changing conditions.
As we navigate this warming world, the call for action and awareness becomes ever more urgent. The data is compelling, and the need for comprehensive climate strategies is clear. The time to address these challenges is now, as the impacts of climate change are felt in real-time, reshaping our seasons and our lives.
