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Climate Impact Company Daily Feature
Issued: Wednesday, July 23, 2025
Highlight: Maine heatwave helps to induce very hot weather China to Japan which is likely to continue.
Fig. 1-4: July 16-22, 2025, temperature anomalies, West Pacific marine heatwave, and ECM 15-day temperature anomaly and percent normal rainfall forecasts.
Discussion: Reported early today is a record number of high temperature days since March in China (Al Jazeera). Most recently, excessive heat has been observed across East-central China where temperature anomalies of +2C to +6C were observed July 16-22, 2025 (Fig. 1). Central and northern Japan also observed anomalous heat. The tendency for hot days is related to a super-warm marine heatwave (MHW) located in the West Pacific and just offshore the East Asia Coast (Fig. 2). The MHW has intensified during July. Aloft, the subtropical high-pressure area strengthens across anomalous warm water areas and the westward extension of the high is causing the East China (and Japan) heat and dry soils. The 15-day outlook maintains anomalous heat and dryness in the drought area (Fig. 3-4) which is home for corn, soybeans, and wheat crop areas. The anomalous heat is producing an extreme strain on the local electricity grid.