August is a great month to visit Brussels, Belgium with the highest average temperature reaching 22C and an average low of 11C. There are 5 hours of sunshine and 16 days of possible rain.
The Crowne Plaza Brussels Airport is great for weary travellers on their way in and out of the city, especially if travelling with children. There's 10 days free parking, too. The Holiday Inn Express, is another good hotel ideally located near the airport.
Veggie Mania takes place between the 1st and the 8th of the month. In fact this is an exhibition that started on October 12th, 2012 and will end on August 8th, 2013, so be sure to go while you still can.
TheBrussels Summer Festival which gathers almost 300 concerts from many different music styles features street theatre, a circus, and other attractions takes place this month. Check out the website for exact dates. TheBruxelles les Bains a beach in the middle of the city will be open from 1-11 August.