Recent meteorological observations from Amsterdam-area stations, including Schiphol, confirm a daily maximum of 21°C on September 11, 2026, aligning precisely with the market's near-certain outcome. This reading reflects typical early-September conditions moderated by Atlantic influences and light winds, falling slightly above the 1991–2020 average high of 19.6°C but well below historical extremes near 29°C. Official data releases from monitoring agencies provide the resolution threshold, with minimal forecast uncertainty remaining as the observation window closes. Revisions to the recorded maximum or disputes over station siting represent the primary, albeit low-probability, scenarios that could shift the implied probability.