They're not doing their own weather predictions, they use different models. You can see them if you click compare for a specific location (Rouen, for example):

They're not doing their own weather predictions, they use different models. You can see them if you click compare for a specific location (Rouen, for example): https://www.windy.com/multimodel/49.44/1.09?temp,49.443,-0.563,8 https://www.windy.com/multimodel/49.44/1.09?temp,49.443,-0.5... the list is scrollable