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Antwerp: Weather Forecast. The warmest day over the next 7 days in Antwerp is forecast to be 24th April at 16Â°C (61Â°F) and the warmest night on 23rd April at 5Â°C (41Â°F). The average temperature over the next 7 days is forecast to be 12Â°C (54Â°F) and there will be 1 day of sunshine . The average for April is 9Â°C (48Â°F) in Antwerp.
September weather in Amsterdam. As mentioned, the weather in Amsterdam tends to be quite mild all summer, and by September itâs usually on the cool side. The highest temperature ever recorded in September is 83Â°F/28Â°C and the daily peak will almost always be fairly close to the 64Â°F/17Â°C? average.