From June 20 through July 2, 2026, the regions from Kanto to Kyushu will experience persistent rain and cloudy conditions as a stationary front remains over Japan. According to weather reports, Tohoku and Hokuriku are nearing the start of their respective rainy seasons, while Okinawa is expected to see continued summer weather.
Rainy Season Patterns and Regional Impacts
A stationary front and low-pressure systems will dominate the weather across Japan from June 20 to June 26. During this period, northern and western Japan will see frequent rain, with potential thunder expected on June 21 and June 22 as a low-pressure system moves across the Sea of Japan. Regions such as Niigata and Fukuoka are specifically noted for these rainy conditions. For the Pacific side of the country, including Tokyo and Osaka, the front will linger near the southern coast, meaning residents should prepare for a week where clear skies are rare and umbrellas are necessary.
Did You Know? The rainy season in Japan is characterized by the presence of a stationary front, often referred to as the baiu front, which dictates weather patterns for weeks at a time by trapping moisture over the archipelago.
Temperature Disparities Across Japan
Temperature trends will vary significantly by region through June 26. In northern areas like Sapporo and Sendai, temperatures are expected to hover around 20°C, creating a chilly atmosphere due to the influence of the Okhotsk High pressure system. Conversely, cities such as Nagoya, Osaka, and Fukuoka will face high humidity with temperatures ranging between 25°C and 30°C. Even on cloudy or rainy days, the heat remains a concern; authorities urge residents in western Japan and the Tokai region to maintain hydration and use indoor air conditioning to mitigate heatstroke risks.
Forecast Through Early July
The pattern of unsettled, rainy weather is projected to continue across Kyushu, Shikoku, and Honshu from June 27 through July 2. Despite the cloud cover, temperatures are expected to remain high, with Tokyo, Nagoya, and Osaka seeing daily highs approaching 30°C. Nagoya is forecast to reach 30°C on both July 1 and July 2. While the rest of the country faces a humid rainy season, Okinawa will continue to experience typical summer skies.
Expert Insight: The persistence of these high temperatures, even in the absence of direct sunlight, creates a deceptive environment for heat-related illnesses. The combination of high humidity and temperatures nearing 30°C often prevents the body from cooling down efficiently. Consistent monitoring of indoor environments and proactive hydration are necessary safety measures during this prolonged rainy period.
Frequently Asked Questions
Will the rainy season arrive in Tohoku and Hokuriku soon?
Yes, reports indicate that the start of the rainy season in Tohoku and Hokuriku is imminent.
What weather should residents in Tokyo and Osaka expect?
Residents in these areas should expect a week where clear skies are limited and rain is frequent, necessitating the use of umbrellas.
Why is there a risk of heatstroke during cloudy weather?
High humidity levels combined with temperatures reaching 25°C to 30°C in western Japan and the Tokai region increase the risk of heatstroke, even when it is cloudy.
How are you planning to manage the increased humidity and heat in your area over the coming weeks?
