**Forecast models indicate a mild overnight period for Amsterdam on September 3, 2026, with the lowest temperature most likely falling in the 16–19°C range.** Southwesterly winds at 10–19 mph (16–31 km/h), combined with extensive cloud cover, showers, and high humidity (often 80–95%), limit nocturnal radiative cooling and keep surface temperatures elevated relative to the long-term average low of ~12°C. Multiple sources, including GFS-based runs and detailed hourly guidance, show early-morning readings stabilizing near 17–19°C (roughly 63–66°F) before daytime highs reach 21–22°C. Recent Septembers have also trended warmer than climatology, with 2024 and 2025 lows of 17.1°C and 16.5°C reinforcing the current pattern. Trader probabilities reflect this: the 43.5% market-implied chance on “22°C or higher” for the daily minimum captures upside risk from limited cooling, while the combined weight on 16–17°C (over 50%) aligns with the consensus minimum under the prevailing mild, moist airmass. Key variables that could shift the outcome include any unexpected clearing that allows stronger cooling or a faster-moving front; however, the latest model consensus points to continued westerly flow and precipitation chances through the night, supporting the observed clustering of probabilities around mid-to-upper teens Celsius.