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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.
Weather Overview for Antwerp. Antwerp has a temperate maritime climate with all four seasons and mild temperatures year round. Antwerp is the capital of the Antwerp province in Flanders in northwest Belgium. It sits on the banks of the River Sheldt around 40 miles from its mouth on the North Sea.