The Shikoku region is bracing for a period of extended heavy rainfall through June 27, 2026, driven by an active rainy season front and the approaching Typhoon No. 7. Residents are advised to prepare for potential landslides, river flooding, and inundation in low-lying areas as the region faces a multi-day weather event.
Ongoing impacts of the active rainy season front
The rainy season front is currently moving north toward Shikoku, with its activity intensifying between June 24 and June 25. According to forecasts, the Pacific side of the region could see localized, extremely heavy rain exceeding 50 millimeters per hour, while the Seto Inland Sea side may experience rates of 30 millimeters per hour.
Projected rainfall totals for the 24-hour period ending at 6:00 a.m. on June 25 are estimated to reach 250 millimeters on the Pacific side and 200 millimeters on the Seto Inland Sea side. Forecasts indicate the front may briefly shift south on June 26 before moving north again, likely leading to continued, cumulative rainfall throughout the day.
Approaching Typhoon No. 7 and weather outlook
Typhoon No. 7 is expected to move toward the Shikoku coast by Saturday, June 27, while maintaining its storm zone. As of 9:00 a.m. on June 24, the storm carried a central pressure of 955 hectopascals and was moving north at approximately 10 kilometers per hour south of Okinawa.
Meteorologists expect the typhoon to shift its course toward the northeast as it nears the region. Because the ground will already be saturated from the preceding days of rainfall, the arrival of the typhoon poses a significant risk of prolonged weather disruption, including strong winds and further heavy rain.
Frequently Asked Questions
What are the specific risks for the Shikoku region through June 27?
Residents should prepare for landslides, flooding in low-lying areas, and river water levels rising due to the combined effects of the stationary rainy season front and the arrival of Typhoon No. 7.
Will Typhoon No. 8 directly affect the weather in Shikoku?
No, Typhoon No. 8 is expected to pass by without a direct impact on the region, though both it and Typhoon No. 7 are likely to cause high waves and swells on the Pacific side starting June 25.
What is the expected timeline for the most severe weather?
Intense rain is expected from the afternoon of June 24 through the morning of June 25, with further heavy rain likely on June 26 and “rough weather” predicted for Saturday, June 27, due to the proximity of Typhoon No. 7.
How are you monitoring the latest developments in your local area to ensure your safety?