About this Market

Ongoing heatwave conditions across eastern Japan, with Tokyo recording its first 35°C+ "extremely hot day" of 2026 on July 14 amid a strong subtropical high-pressure system, anchor trader expectations for late-July peaks near the seasonal norm. Recent Japan Meteorological Agency data and extended-range outlooks indicate above-average temperatures persisting into the core heat window of late July, when Tokyo highs frequently reach 33–37°C due to urban heat island effects from concrete and buildings amplifying daytime warming. The tight clustering around 34–36°C reflects genuine short-term forecast uncertainty: small differences in high-pressure strength, wind patterns, cloud cover, or isolated showers could shift the maximum by 1–2°C, while model consensus from agencies like JMA and NOAA supports no immediate cooling trend before July 22. Historical climatology shows Tokyo’s July average high has risen roughly 1.5°C over decades, placing these outcomes firmly within the current distribution rather than extremes.