Forecast uncertainty in short-range numerical weather prediction models is the main driver behind the closely bunched market-implied odds for Moscow’s peak temperature on August 7. Current guidance from multiple sources shows daytime highs potentially reaching the low 30s Celsius amid a warm air mass, with some runs indicating 32–33 °C and others capping near 29–30 °C depending on cloud cover, timing of any thunderstorms, and boundary-layer mixing. This spread produces the observed clustering around 29–32 °C outcomes. August climatology places typical Moscow highs near 23 °C, so the elevated readings reflect a transient heat anomaly whose exact peak hinges on the next 48-hour model updates and observational data from regional stations. Traders are effectively pricing the range of plausible outcomes from ensemble forecasts rather than a single deterministic value.