Highest temperature in Tokyo on August 15?

Traders currently price "29°C" at 100% for "Highest temperature in Tokyo on August 15?". Over the past 24 hours that probability moved up 75.4 points. Full distribution: 29°C 100%, 24°C or below 0%, 25°C 0%, 26°C 0%. The market has traded $83K in total volume and resolves Aug 15, 2026. **Japan Meteorological Agency forecasts and supporting model runs have converged on a daytime maximum of 29°C for Tokyo on August 15, 2026, driving the market’s near-certain 100% implied probability for that outcome.** Late-summer atmospheric conditions—high humidity, light winds, and scattered showers—limit strong daytime heating while the urban heat island effect maintains baseline warmth near seasonal norms. JMA guidance issued around August 12–14 projected a high of 29°C with minimal spread across ensemble members, consistent with the city’s late-August climatology when adjusted for transient cloud cover and no incoming fronts or typhoon influences. Traders are weighting these stable, observationally confirmed conditions heavily, as final resolution depends on the official 24-hour maximum recorded at designated stations. The only realistic challenges would be an unforecasted burst of insolation clearing skies earlier than expected or a localized measurement anomaly exceeding model uncertainty ranges of roughly ±1°C.

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