Forecast models from sources including GFS and regional agencies indicate a highest temperature in Munich on September 13, 2026, most likely in the low 20s °C, driven by increasing cloud cover, light rain or showers developing in the afternoon, and moderate westerly winds that limit daytime heating. Current observations show morning temperatures in the mid-teens °C rising slowly under overcast skies, consistent with September climatology where the long-term average high is near 20 °C. These conditions explain the market's tight clustering around 22 °C (37.5% implied probability) and 23 °C (26.0%), with lower odds on 21 °C or below reflecting residual uncertainty in exact peak timing before precipitation intensifies. Updated model runs and official observations through the afternoon will determine final resolution.