The hottest it gets in Belgium is 18 degrees and the coldest it drops to is 3 degrees. The best time to visit is in summer when it gets to around 12-18 degrees.
The currency is euro's. one euro is 1.31. It's not very cheap to travel to Belgium because you need double the money because say you have $100 that's only 60€.
The town of Spa is situated in a valley in the Ardennes mountains 35 kilometres southeast of Liège and 45 kilometres southwest of Aachen. In 2006, Spa had a population of 10,543 and an area of 39.85 square kilometres.