Liege is a French speaking city located along the Meuse river in the Wallonia portion of Belgium. Wallonia has a moderate historic climate with less rainfall and colder winters than in the northern Flanders region of Belgium.
As with other travel destinations within Belgium, May through September is the best time to go to Liege. October starts to get cold. Snow is likely during winter months.
The city maintains a comfortable temperature in summer, when Liege hosts some of its renowned folk festivals, the largest on August 15 called "Le 15 août".
Rain is spread pretty evenly over the year. Summer rain can cause the temperature to seem warmer than it is due to the humidity.
Wallonia weather is known to be rather changeable, so be prepared. Rain is frequent but wait a while and it'll probably change. You might think about bringing an umbrella and sweather (or planning to buy one in Liege the first day it rains).
The charts below show the historic monthly high and low temperatures in Liege as well as the monthly rainfall below that.
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L'Appart-Hôtel SIMI (apartments)
Best Western Univers Hotel (value)