As September 2026 closed without any Atlantic tropical system attaining hurricane strength, market-implied odds reached 100% on no formation that month, reflecting National Hurricane Center observations of persistently unfavorable conditions including elevated wind shear, dry air intrusions, and cooler sea-surface temperatures that suppressed organization. This outcome aligns with the absence of named storms meeting the 74-knot threshold on the Saffir-Simpson scale through the final days. The 0.1% probability attached to September 26–30 underscores the negligible chance of a last-minute intensification that failed to materialize. While official post-season reviews could theoretically revise intensity estimates, such adjustments remain rare once NHC analyses are finalized.