This page documents all tornadoes confirmed by various weather forecast offices of the National Weather Service in the United States in September, October and November 2023. Tornado counts are considered preliminary until final publication in the database of the National Centers for Environmental Information. On average, there are 66 confirmed tornadoes in the United States in September, 59 in October and 54 in November.
In September, tornadoes are most likely to occur in relation to the Atlantic hurricane season (as September is the peak month of hurricane season), and they can occur almost anywhere in the southern and eastern states as a result of landfalling tropical cyclones should such occur. A secondary focal point lies in the Midwest and Great Lakes as a result of early-autumn frontal systems. While tropical activity tends to decrease in October, the relative peak shifts into the Great Plains and towards the southern states as the jet stream shifts southward (albeit generally with less activity than in the spring months in the same regions). In November, these tornadoes are most likely in the southern states, closest to the warm Gulf of Mexico moisture, with occasional incursions farther north into the Midwest.
With relatively quiet tropical activity in the United States in September and few early-season frontal systems, tornadic activity in September was almost non-existent, with only very isolated, weak tornado touchdowns. Only 10 tornadoes were confirmed, making it the least active September since 2009. October also saw well below normal activity, but had more significant tornadoes than the previous year.