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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.
At other times, when a high pressure system moves over the country, a phenomenon quite rare but not impossible, the weather becomes cold and gray, with possible fog and overcast sky. Summer in Belgium is pretty cool on the coast, with maximum temperatures reaching 21/22 Â°C (68/72 Â°F) in July and August. There is no shortage of clouds and rains, due to Atlantic fronts, which even in this season can affect the country.