The chart below shows the historic high and low temperatures in Gent, with the rainfall below that. Bruges climate will be similar.
Flanders weather is known to be rather changeable, so be prepared. Rain is frequent in spring and fall, but wait a while and it'll probably change. You might think about bringing an umbrella and sweather (or planning to buy one in Gent the first day it rains).
Brugge, perhaps the most popular tourist destination in Belgium, is crowded in summer and especially during the procession of the Holy Blood in May.
As with other travel destinations within Belgium, May through September is the best time to go. July offers the Gent Festival, and is a great time to visit Gent. Winter can be colder than you'd expect.
Gent (French) or Ghent (Dutch) and Brugge are two compelling tourist destinations in the north Flanders region of Belgium. Their temperatures are moderated by proximity to the sea. Flanders has a moderate historic climate with frequent rainfall like adjacent Netherlands, as you can see from the temperature chart below.
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B&B Het Rommelwater (value)