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human
[Lord Of The Rings] Did Saruman make it rain (with a spell) at the Battle of Helms Deep in LOTR: The Two Towers?

I am watching the movie LOTR: The two towers atm, and saw something rather remarkable. 
Right before the battle starts, it suddenly starts to rain, my guess is that that was used to make it less easy for the archers to kill the orks and etc... And after a while, when the orks (and etc.)  had reached the castle wall, it stopped raining. I think so the orks wouldn't slip off the ladders or something and the rain wouldn't have a negative effect on the archers because they had to switch from bow and arrow to their swords for close combat.

So the rain did not really have any negative effect on Saruman's army, but it did have that effect on the humans/elves... 
So my question is.. was this one of Saruman's doings? Or just because it made the scene more dramatically..?

(Idk if this theory has already been confirmed or not btw)
gpt
No. In the books, Saruman didn’t have the power to control the weather like he did on the mountain side in Fellowship. But was more a master genius in crafting and had a powerful voice to manipulate and influence. The storm occurs in the book battle as well and is mainly added to add dread and imply the coming storm of Saruman’s army.