I'm not picklepikkl... but I seem to remember something (either in the chapters where we dealt with Hubert, or with Maria Strossel) that to those attuned to Azyr, sometimes their mage sight carries hints of the future.
But I could be mistaken.
My guess why Mathilde doesn't see the future in every patch of Azyr/Shysh that she sees, is because that requires the wind to be in her brain, and her brainmeats are full of Ulgu, and so repel Azyr/Shysh.
Volans is the counter example, who honed his Witchsight to the greatest degree without ever touching a Wind.