As spring unfolds, the weather across Japan is taking a decidedly warm turn, with temperatures soaring to early summer levels. According to various reports, the weekend of April 19 and 20, 2025, promises mostly sunny skies, but with a notable shift in weather patterns expected on Sunday.
On Saturday, April 19, the weather forecast indicates that a high-pressure system will dominate, leading to predominantly clear skies. The expected high temperature for many regions will hover around 25 degrees Celsius, marking a continuation of the unseasonably warm weather that has characterized recent days. This warmth is a stark contrast to the cooler temperatures typically experienced during this time of year.
However, the pleasant conditions may not last long. As we transition into Sunday, April 20, clouds are anticipated to roll in, with a chance of localized rain showers in some areas. The low temperature in the plains is projected to be around 15 degrees Celsius, ensuring that mornings remain relatively mild.
In a report by WeatherNews, it was highlighted that both Western and Eastern Japan would experience sunny weather on April 19, yet residents in the Kanto and Tokai regions are urged to exercise caution regarding heatstroke. The report emphasizes the importance of staying hydrated and taking breaks from the heat as temperatures are expected to rise significantly.
On April 18, just a day prior, daytime temperatures had already exceeded 25 degrees Celsius in various locations, giving a preview of the early summer-like conditions. In Seoul's Yeongdeungpo District, for instance, citizens enjoyed leisurely moments in the Han River Park, basking in the pleasant weather.
Looking ahead to the weekly forecast from April 19 to April 25, meteorologists predict that the warm weather will persist, particularly in areas from southern Tohoku down to Okinawa, where summer-like temperatures above 25 degrees Celsius are expected. Some inland areas, such as Kumagaya and Kofu, may even reach highs of 30 degrees Celsius, pushing the boundaries of seasonal norms.
However, the forecast indicates that the warm spell will be interrupted. By Sunday, the arrival of low-pressure systems and fronts will bring about a deterioration in weather conditions, with rain likely to affect northern Japan and the Sea of Japan side from eastern to western regions. This shift is expected to result in lower maximum temperatures compared to those recorded on Saturday.
The weather is anticipated to improve again on Monday, April 21, with many areas west of Kanto returning to summer-like conditions. Yet, the rain will begin to spread from the west as early as Tuesday, April 22, leading to a nationwide rainy day on Wednesday, April 23.
As we move towards the end of the week, conditions are expected to stabilize, with clearer skies returning from April 24 to April 25. This pattern of fluctuating weather, typical of spring, will require residents to stay alert and adapt their clothing and outdoor plans accordingly.
Looking further ahead, the Golden Week holiday period is projected to see a similar trend, with weather changing in short cycles. A stable high-pressure system is expected to cover the region, leading to more sunny days than usual compared to the average year.
As temperatures trend toward normal or even above average in northern and western Japan, there remains a possibility of continuing unseasonably warm conditions. This could pose challenges for those planning outdoor activities, as the body may not yet be acclimated to the rising heat.
In summary, while the weekend starts off with lovely weather, the forecast suggests a swift transition into rain and cooler temperatures by Sunday. Residents are advised to enjoy the warm days responsibly, keeping in mind the potential for heat-related illnesses as the mercury rises.
