Weather and its (Germanic) kindred terms wind and window are derivatives of the very common, very complicated Proto-Indo-European root awe-, awē-, wē- “to blow.” The variant awe- is the source of Germanic wedram “storm, weather” (Old English weder, English weather ). The suffixed variant wēn- forms Latin ventum “wind,” and English wind and window.
Window is first recorded in Middle English in the first half of the 13th century. It comes from Old Norse vindauga “wind eye,” originally an opening in a gable or roof to release smoke and admit light. (The Old Norse word came into Old English before the initial w- became v- in literary Old Norse.)

Did you mean underwater?