Rain is expected across western and eastern Japan on July 5, with a heightened risk of thunderstorms and heavy rain in northern Kyushu [1].

These weather patterns pose a significant risk of landslides and flash flooding, requiring residents in affected areas to remain vigilant as moisture levels rise. The instability is driven by the Meiyu rainy front and accompanying low-pressure systems moving southward [3].

Forecasts for northern Kyushu show a potential for intense weather, though timing varies by source. Some reports indicate heavy rain and thunderstorms will begin the morning of July 5 [1, 2], while other data suggests the heavy precipitation will resume during the night [2].

Temperature forecasts for major cities reflect the seasonal shift. In the west, Fukuoka and Kochi are both expected to reach high temperatures of 29 degrees Celsius [1]. Hiroshima is forecasted to reach 27 degrees Celsius [1].

Further east and north, temperatures remain more moderate. Tokyo and Sapporo are both expected to hit highs of 25 degrees Celsius [1].

Authorities advise caution regarding the potential for landslides as the soil becomes saturated from the incoming front. The combination of the Meiyu front and low-pressure systems continues to create atmospheric instability across the region [3].

“Rain is expected across western and eastern Japan on July 5”

The movement of the Meiyu front is a critical seasonal event in East Asia that often triggers severe flooding. The discrepancy in timing for northern Kyushu's heavy rain—ranging from morning to night—suggests a high level of atmospheric volatility, meaning local residents should prepare for sudden weather shifts regardless of the specific hour.