The elevated 2026 West Nile virus transmission season in New York City, with 29 neuroinvasive cases and record 1,769 positive mosquito pools reported by late September, forms the main driver behind trader consensus favoring the 35–49 range at 63% implied probability. Warmer temperatures and moisture conditions have boosted Culex mosquito abundance and accelerated viral replication within vectors, consistent with established links between climate factors and WNND incidence. This trajectory already surpasses the full-year 2025 total of 16 neuroinvasive cases and aligns with the recent five-year average of 25–31 annually, though October surveillance updates and any late-season cooling could shift final counts. Historical variability, including 36 cases in 2022, supports the modest probability assigned to 50 or more.