Record Heat, Sparse July Rain: Japan Forecaster Explains Summer’s Extremes
Tokyo, Japan – September 6, 2025 - Japan experienced a summer of unprecedented heat alongside surprisingly light rainfall in July, conditions weather forecaster Maki Yoshiyuki of the Japan Meteorological Association attributes to a complex interplay of global weather patterns and localized atmospheric conditions. The combination resulted in widespread heatstroke cases and concerns over agricultural impacts, prompting a detailed analysis of the season’s anomalies.This summer’s extreme weather isn’t simply a matter of seasonal variation; it reflects a shifting climate and the increasing frequency of record-breaking events. Millions across japan felt the impact of prolonged heatwaves, while farmers and water resource managers grappled with the consequences of a drier-than-usual July. Understanding the factors driving these conditions is crucial for preparedness and mitigation efforts as climate change continues to reshape weather patterns.
Yoshiyuki explains the record-breaking heat stemmed from a persistent high-pressure system dominating the region. This system, stronger and more stationary than usual, trapped warm air over Japan for extended periods. Contributing to this was a weakening of the jet stream, allowing the high-pressure area to expand and intensify. The result was a series of heatwaves, with temperatures repeatedly exceeding past averages.
The lighter-than-normal rainfall in July, Yoshiyuki notes, was linked to the positioning of the Pacific High, a subtropical high-pressure system. Its unusual westward extension steered rain-bearing systems away from much of Japan.Furthermore, a decrease in moisture transport from the south contributed to the drier conditions. This pattern contrasted sharply with typical july weather, which usually brings a period of notable rainfall associated with the Baiu (plum rain) season.
Yoshiyuki, a Heat stroke prevention instructor at the Japan Meteorological Association Head Office, emphasizes the importance of continued vigilance.”I will do my best to convey the weather information to everyone in an easy-to-understand manner,” she states, highlighting the need for clear communication regarding extreme weather risks. She urges the public to stay informed about forecasts and take necessary precautions to protect themselves from heat-related illnesses and potential water shortages.
[Image of Maki Yoshiyuki, Japan Meteorological Association Weather Forecaster]
Maki Yoshiyuki, Weather Forecaster at the Japan Meteorological Association.
looking ahead, Yoshiyuki stresses the need for ongoing research and improved forecasting models to better predict and prepare for future extreme weather events.The Japan weather Association continues to monitor evolving conditions and provide timely updates to the public.
