The wind changed (as Ghân-buri-Ghân observed). A fresh southerly wind from the sea - the same that filled the sails of Aragorn's hijacked Corsair ships - scattered the clouds of Sauron's darkness.
If you're looking for a supernatural agent who caused the wind, the obvious candidate would be Manwe (with a little help from Ulmo, perhaps).
(EDIT: x-ed with Inziladun)
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Und aus dem Erebos kamen viele seelen herauf der abgeschiedenen toten.- Homer, Odyssey, Canto XI
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