Whats the weather like in belgium?

It is what is known as 'temperate maritime'. It has mild Summers that can be damp or drizzly, and Winters that are cold but not exceedingly so.

Generally speaking it has not suffered the extremes of weather patterns that the British Isles have done over the past few years, due largely to the fact that Britain and Ireland tend to shield it from the Atlantic storms and freak Arctic Winters.