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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.
Brussels: Annual Weather Averages. July is the hottest month in Brussels with an average temperature of 18Â°C (64Â°F) and the coldest is February at 3Â°C (37Â°F) with the most daily sunshine hours at 6 in December. The wettest month is June with an average of 90mm of rain.