Key Facts
• From April 14, a stationary front will linger south of Honshu, causing persistent rainy weather.
• April 15–16 expected widespread rain across western and eastern Japan; rain intensity uncertain.
• April 18 may see further cloudiness and possible weather deterioration due to a trough.
• Daytime highs often exceed 20°C in eastern Japan; western Japan may reach above 25°C (summer day).
• Large temperature differences between daytime and mornings/evenings; dress accordingly.
• Cherry blossoms are in full bloom in Tohoku; the bloom front will reach Hokkaido by next weekend.
• Typhoon No. 4 (Sinlaku) has intensified to a “violent” level near the Mariana Islands, moving slowly north.
• Ogasawara Islands may experience strong winds and high waves from April 16 to 18 due to the typhoon.
• No direct impact expected on mainland Japan, but typhoon path remains uncertain; monitor updates.
Summary
This week, a stationary front south of Honshu will bring unsettled, rainy weather reminiscent of the rapeseed flower rainy season, especially from April 14 to 18. Western and eastern Japan should prepare for frequent rain and cloudy skies, with April 15–16 being the wettest period. Temperatures will be warmer than average, with eastern Japan often exceeding 20°C and western Japan reaching summer-like 25°C or higher. Large temperature swings between day and night require flexible clothing and attention to health. Cherry blossoms are currently peaking in Tohoku and will soon arrive in Hokkaido. Meanwhile, Typhoon Sinlaku, now a violent storm near the Mariana Islands, poses a threat to the Ogasawara Islands with strong winds and high waves expected midweek. Although mainland Japan is unlikely to be directly affected, residents and visitors to Ogasawara should stay alert and follow weather updates closely.
