Forecast models from major centers show Amsterdam's June 18 maximum likely peaking near 27–28°C at representative stations such as Schiphol, driven by southerly flow under building high pressure that advects warmer continental air while limiting cloud cover and allowing strong diurnal heating. Ensemble spreads in the 1–2°C range, arising from minor differences in boundary-layer mixing and timing of any weak frontal passage, produce closely matched market-implied odds between these two outcomes. Historical June maxima average 20–23°C, so current guidance sits well above climatology yet below extreme thresholds. Traders are monitoring the final 00Z–12Z model runs and KNMI verification data expected by evening of the 18th, which will resolve any last adjustments from evolving surface observations.