What makes you think it won’t have any? Insomniac were the kings of weather FX with Second Son, right?!
Im like 99% sure, there will be day & night cycles.
And the clouds will move from day to day.... but hes right, no trailers have shown rainy weather.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071