Recent forecasts from multiple models converge on a daily maximum of 20–21°C for Moscow on September 4, driven by mild southwesterly flow under partly cloudy skies with limited precipitation. Ensemble spreads and minor differences in cloud timing or boundary-layer mixing create the tight clustering among 20°C, 21°C, and 22°C outcomes, as small shifts in insolation or advection can alter the peak by 1–2°C. This is modestly above the 1991–2020 climatological high of 18.7°C for the date. Official resolution will rely on measurements from the primary Moscow station (likely VDNKh), where urban effects and precise observation timing add further uncertainty. Updated model runs and any late adjustments to frontal positioning remain the key near-term catalysts.