Why is the ninth month called September?
1580s, possibly a dialectal survival from Old Norse gustr "a cold blast of wind" (related to gusa "to gush, spurt") or Old High German gussa "flood," both from Proto-Germanic *gustiz, from PIE *gheus-, from root *gheu- "to pour" (see found (2)). Probably originally in English as a nautical term. As a verb, from 1813. Related: Gusted; gusting.
in meteorology, a sudden increase in wind speed above the average wind speed. It is briefer than a squall and usually lasts 20 seconds or less. Air turbulence around an obstacle causes gusts; they occur frequently over buildings and irregular ground and are less frequent over water. The term gust also denotes a sudden change in wind speed relative to a flying aircraft.