Isaiah chapter 46 has wording that can help:
NIV
9 Remember the former things, those of long ago;
I am God, and there is no other;
I am God, and there is none like me.
10 I make known the end from the beginning,
from ancient times, what is still to come.
I say, ‘My purpose will stand,
and I will do all that I please.’
11 From the east I summon a bird of prey;
from a far-off land, a man to fulfill my purpose.
What I have said, that I will bring about;
what I have planned, that I will do.
ESV:
9 remember the former things of old;
for I am God, and there is no other;
I am God, and there is none like me,
10 declaring the end from the beginning
and from ancient times things not yet done,
saying, ‘My counsel shall stand,
and I will accomplish all my purpose,’
11 calling a bird of prey from the east,
the man of my counsel from a far country.
I have spoken, and I will bring it to pass;
I have purposed, and I will do it.
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Here the wording is to do what it takes to cause an outcome:
"...will do"
"...I will bring about"
"I will accomplish all my purpose"
"...what I have planned, that I will do"
So, the future is set for some certain particular things -- certain things which God has chosen to cause to happen, to accomplish, to bring about, to do.
Those will happen. Other details, like hurricanes, nice spring rains, and all the rest -- are nature in action, naturally, His design working on it's own. We are not told that nature is fully deterministic, so that it is only a clockwork universe. Since scripture does not say nature is fully deterministic, all the future already fixed in all ways, we can't assume it is.