SpaceX's September 2026 launch cadence centers on a cluster of confirmed Falcon 9 missions, including Starlink Group 15-23 on September 2 from Vandenberg, Starlink Group 15-24 on September 5, Crew-13 on September 12 from Cape Canaveral, and the O3b mPOWER triplet on or after September 19. Traders weigh these against the potential for additional Starlink flights and the timing of Starship Flight 14, which remains listed as NET September from Starbase but carries execution risk typical of test articles. The closely matched probabilities around 12–13 launches reflect uncertainty over extra constellation deployments, possible Q3 military payloads slipping into the month, and historical scrub or weather impacts that can shift one or two missions. This tight spread captures real-money consensus on SpaceX's reusable booster throughput and Starship maturation versus schedule slippage near the start of the period.