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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.
Summer. Summers are pleasantly mild in Brussels, with daily high temperature averages in the upper 60s in June and the lower 70s in July and August. Morning lows are in the 50s. Belgiumâs flowers and gardens stay green during the summer because the city receives about 10 days of rain per month.russels is also the capital of the European Union. The city has a maritime temperate climate that is influenced by storm systems from the North Atlantic Ocean. The Brussels region has many parks and green areas, which allow visitors to spend time outdoors and enjoy the cityâs weather.