Nothing has been said regarding this. Given that the game is using the Snowdrop Engine, it is likely that planets will include those features; but some confirmation would be great.
#Will each planet feature real-time day/night transitions & random weather?
south ruin
supple sleet
I mean most likely, I hope so. Desert planets having sandstorms like Tatooine
meager egret
maybe we will have seasons. and different time lengts. but i really hope we can land on the planets like in no mans sky not like in starfield
supple sleet
If they have Tatooine, I hope they have like the two suns and how long a day is because of where they are in the galaxy
cold trout
tatooine should have sandstorms and hurricanes
dusky mason
Kijimi can have blizzards. It looks like all the planets will have day and night cycles because we see tatooine during the day in part of the trailer and sunset too
south ruin
I just would like it to realistically cycle between on and off for the weather. Like I don't want to land on Akiva and it's always raining, or on Kijimi and it's always snowing. It should only do it sometimes.
dusky mason
It would be cool if there is different weather at times like sometimes tatooine has sandstorms and makes it harder to do quests
dusky mason
I hope there will be rain on toshara 
that would be peaceful
south ruin
Maybe so
dusky mason
It would be cool
south ruin
We shall see soon enough
dusky mason
Imagine flying a spaceship in the rain
south ruin
Or landing in it and soaking up that sweet atmosphere
dusky mason
That would be nice to land on a planet when it’s raining or snowstorm
south ruin
Indeed it would and I hope it happens!!