Mount Storm is an unincorporated community in Grant County, West Virginia, United States. Mount Storm lies on the Northwestern Turnpike (U.S. Route 50) at its junction with West Virginia Route 42. The community is the site of the Union School Complex, which contains Union High School.
The climate in this area has mild differences between highs and lows, and there is adequate rainfall year round. According to the Köppen Climate Classification system, Mount Storm has a marine west coast climate, abbreviated "Cfb" on climate maps.