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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.
Average precipitation - Brussels. Winter in Belgium is cold on the coast, but not icy. The average temperature in February (which on the coast is, albeit slightly, the coldest month) is about 3.5 Â°C (38.5 Â°F). Sunshine is rare and the rains are frequent.