West Pacific Marine Heatwave Maintains China/Japan Excessive Heat Risk

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Climate Impact Company Week 2-4 Outlook

China

Issued: Friday, August 1, 2025

Highlight: West Pacific marine heatwave maintains China/Japan heat.

Charts of the day: The hot JUL-25 East China/Japan climate,

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Discussion: Searing heat dominated East China and Japan beneath intense subtropical high pressure during July 2025.

Week-2 Ahead Forecast valid August 10-16, 2025: Intense heat eases.

Discussion: The intense heat across East China and Japan eses slightly mid-August although Northern China shifts much drier.

Week-3 Ahead Forecast valid August 17-23, 2025: Regenerating heat.

Discussion: High pressure rebuilds and causes excessive heat to regenerate across China and Japan after mid-August. Northern China reverses wetter with frequent thunderstorms.

Week-4 Ahead Forecast valid August 24-30, 2025: More excessive heat.

Discussion: Northern China is wet while to the south, intense heat continues and Japan is very dry.