Forecast models for Moscow on September 1 point to a daytime maximum near 23–26 °C, with official Russian Hydromet guidance and ensemble runs centering on 21–26 °C under partly cloudy skies and a modest chance of scattered showers or thunderstorms. This range of outcomes arises because modest differences in cloud cover and timing of any precipitation can alter surface heating: clearer intervals allow greater solar insolation and higher peaks near 26–27 °C, while earlier or thicker cloud decks and evaporative cooling from rain suppress the maximum toward 23–24 °C. Southerly flow is expected to maintain relatively mild air masses, but local variability in boundary-layer mixing and convective development creates the tight spread reflected in the closely matched market probabilities around 24–26 °C. New model runs and updated guidance over the next 48 hours will likely narrow the distribution before resolution.