The Tokai region is expected to experience persistent rainfall from Saturday, July 4, through Tuesday, July 7, as a stationary rain front lingers over Honshu. According to the Japan Meteorological Association, this period of wet weather will be followed by a transition to sunny, high-temperature conditions beginning Wednesday, July 8, as high-pressure systems move in. Regional officials are warning residents to remain vigilant regarding potential landslides due to ground instability from previous heavy rainfall.
Rainfall expectations and safety warnings
Meteorological forecasts indicate that the rain front will move from the west and settle over the Tokai region starting July 4. Rainfall is expected to be continuous with varying intensity, with some areas in Mie and Gifu prefectures potentially seeing 48-hour precipitation totals between 50 and 200 millimeters by July 6. Because the region has faced repeated heavy rainfall since late June, the Japan Meteorological Association warns that even lower amounts of rain could trigger landslides in areas where the ground is already saturated.
When will the rainy season end?
The latest projections from the Japan Meteorological Association suggest the rainy season in the Tokai region will likely end around July 20. This timing is consistent with historical averages, as the region’s typical end date is July 19. However, weather patterns remain volatile; there is a possibility that moisture associated with Typhoon No. 9 could bring a return of rainy conditions by mid-July. Last year, the rainy season ended significantly earlier, on June 27.
Did You Know? The Tokai region’s rainy season end date varies significantly from year to year; while the average is July 19, the 2025 season concluded on June 27.
Managing heat and weather risks
Even during the current rainy period, high temperatures remain a concern. Parts of Aichi, Gifu, and Mie prefectures have already recorded “midsummer days” with temperatures exceeding 30°C. Residents are advised to use air conditioning and maintain consistent hydration to prevent heatstroke, particularly during the humid intervals between rain showers.
Expert Insight: The primary risk for the Tokai region is the cumulative impact of water saturation. When the ground is already unstable from previous weather events, the threshold for geological hazards drops. Residents should prioritize safety by monitoring local warnings, as the transition to high-pressure heat on July 8 does not immediately mitigate the risks left behind by the preceding four days of rain.
Frequently Asked Questions
When will the rain stop in the Tokai region?
According to the Japan Meteorological Association, the current rainy period is expected to last through Tuesday, July 7, with a shift to sunny weather beginning Wednesday, July 8.
What is the expected rainfall amount?
Between the morning of July 4 and the following 48 hours, some areas in Mie Prefecture are expected to see 100 to 200 millimeters of rain, while parts of Mie and Gifu may receive 50 to 100 millimeters.
When is the rainy season expected to end?
The current forecast estimates the end of the rainy season around July 20, though moisture from Typhoon No. 9 could potentially cause a temporary return of rainy weather in mid-July.
How are you preparing your home for potential landslide risks during this period of extended rainfall?
Worth a look