By Matt Underwood Japan is currently experiencing a significant heatwave, with temperatures soaring above 38 degrees Celsius in many areas. This blistering heat has led to Tokyo recording its first “extremely hot day” of 2026, a stark indicator of the intensifying summer conditions across the nation. The discomfort is palpable, with many feeling a level of heat that is entirely new and overwhelming, especially when contrasted with milder climates like those found in parts of the UK. This instant and intense sweating upon stepping outside, a sensation far beyond what many are accustomed to at home, paints a vivid picture of the oppressive warmth.
The presence of high humidity further exacerbates these already punishing temperatures, creating a sticky and uncomfortable environment that many find “fantastically miserable.” For those who have experienced Japan in the summer before, this current heatwave might feel like a resurgence, perhaps even a “revenge” for periods of cooler weather experienced previously. However, for some, the current heat, while undeniably intense, doesn’t quite match the ferocity of the past few years, leading to a feeling of gradual acclimatization, like a frog slowly adjusting to boiling water. The recurring sentiment is that these intense heat events are happening, despite the existence of individuals who still deny the reality of climate change.
The stark reality of these rising temperatures raises broader questions about humanity’s impact on the planet. The current global systems are being scrutinized, with some lamenting how human actions have led to such environmental degradation. For those more familiar with Fahrenheit, temperatures hitting 38°C equate to a sweltering 100.4°F, a figure that sparks immediate concern and comparison to their own experiences. In places like Southern Ontario, which shares a comparable climate, a similar heatwave is also in full swing, with reported temperatures feeling significantly hotter than the actual mercury reading due to underlying humidity.
Interestingly, while some regions are experiencing extreme heat, others, like parts of Australia, have been unseasonably cold, even to the point of pest infestations within homes. This highlights the uneven distribution of climate impacts. The general perception is that Japan, and Tokyo in particular, is a humid country, which would naturally intensify the feeling of heat. However, even without extreme humidity, the prospect of “Tokyo hot” is enough to deter many. Some recent visitors to Ueno noted that the weather was quite tolerable just days prior, indicating a rapid escalation of the heat.
The contrast between different regions within Japan is also notable. While some areas are baking, places like Amami, theoretically semi-tropical, are reporting more comfortable temperatures of around 31°C. This makes San Francisco, with its increasingly mild summers, a tempting destination for those seeking refuge from the global overheating. For individuals planning trips to Japan, the current conditions might necessitate a reassessment of their itinerary, with indoor activities becoming the primary focus. The precise temperature readings are also a point of discussion, with some clarifying that official figures might be slightly lower than perceived, though still undeniably hot.
Reports from recent visitors to Tokyo suggest that the recorded temperatures might not reflect the full extent of the heat experienced. While weather apps may show figures in the 80-90°F range (around 27-32°C), this is still considered comfortable walking weather, especially when dressed appropriately and mindful of personal limits. The idea of “Jeppan-yaki,” a playful pun on the Japanese dish, captures the essence of the sizzling conditions. Meanwhile, daily life in places like Darwin, Australia, is characterized by even more extreme heat, making Europe’s recent summer heatwaves seem almost mild in comparison.
The availability of air-conditioned public spaces, such as convenience stores, offers a welcome respite during these heatwaves, a luxury not always present in other parts of the world. The comparison with the UK’s heat is complex; while some question the extent of its humidity, others recall periods of intense heat coupled with noticeable humidity. The relentless nature of the heat in regions like Kyushu, where temperatures barely drop at night, is a significant factor contributing to the overall discomfort, a stark contrast to the night cooling experienced in the UK.
The notion that these heatwaves are occurring so early in the season, particularly in Tokyo, raises concerns about the changing climate patterns. It’s also important to remember that official temperature readings are typically taken in shaded conditions. Actual temperatures in direct sunlight can be significantly higher, potentially adding another 10-15 degrees Celsius to the recorded figures. The comparison to regions with consistently high humidity further underscores how oppressive the current conditions in Japan can be, leading to feelings of suffocation and exhaustion even without significant physical exertion.
The connection between these extreme weather events and climate change is undeniable for many, who express frustration with continued denial. The argument that El Niño is particularly bad this year is also a contributing factor, but it is framed within the larger context of decades of climate change. The visual of moss used as grass in many Japanese temples offers a unique perspective on how the environment adapts, but it also hints at the pervasive humidity that characterizes many parts of the country. The sheer intensity of the heat, with some believing actual temperatures to be higher than officially reported, leads to expressions of feeling like they are “drying out.”
The debate around temperature readings and reporting continues, with some emphasizing the importance of official meteorological data over anecdotal evidence. Regardless of the exact figures, the impact on daily life is profound. For those in their later years, the combination of rising pension ages and increasingly severe summer heat presents a worrying prospect, with fears of not surviving the heat. This escalating climatic challenge forces a re-evaluation of how societies are prepared for and adapt to these unprecedented environmental conditions. The experiences of people in regions like Texas, where 40-42°C is a regular summer occurrence, and Japan, where heat and humidity combine to create a potent discomfort, highlight the global nature of this warming trend. The lack of air conditioning in many Japanese homes and buildings is identified as a critical issue that amplifies the impact of outdoor heat. The relentless nature of the heat, with minimal relief even at night, especially in areas like Kyushu, makes it a significantly more challenging experience than many parts of Europe have recently faced. The sentiment is clear: Japan is indeed sizzling, and the implications of this intensifying heat are far-reaching.