SpaceX's September 2026 launch cadence centers on a handful of confirmed Falcon 9 missions from Vandenberg and Cape Canaveral alongside uncertainty over additional Starlink batches and military payloads. Early-month Starlink Group 15-23 and 15-24 flights, the Crew-13 crewed mission, O3b mPOWER satellites, and a Space Development Agency Tranche 1 Transport Layer payload anchor the schedule near 4–6 attempts, while Starship Flight 14 remains a potential wildcard at Starbase. Traders weigh historical Falcon 9 rates of 8–10 per month against the shift of Florida Starlink operations to Starship, plus typical risks from weather, range availability, and test-flight slips. This produces the tight clustering around 12–13 total launches, reflecting real-money consensus on execution variables in the final weeks before September.