Traders have converged on 17°C as the near-certain high for Munich on June 11 because official forecasts from European meteorological services and real-time observations consistently point to a daily maximum in that narrow range under mostly cloudy, showery conditions. Early-morning readings near 11–12°C and model consensus for afternoon peaks around 17°C, well below the June climatological average of 21–22°C, have eliminated meaningful probability for other outcomes. This skin-in-the-game consensus reflects the stability of short-range numerical weather prediction for a mid-latitude summer day with limited diurnal variability. A late-afternoon clearing trend or localized station measurement differing by even 1°C from the primary reporting site could theoretically shift the recorded high, though current atmospheric steering patterns make such a revision unlikely before resolution.