Trader consensus on Polymarket reflects profound uncertainty for Houston's highest temperature on April 9, with market-implied odds evenly split at 51% across bins from 57°F or below to 76°F or higher, signaling balanced bets amid divergent forecast models. Recent GFS and ECMWF ensemble runs show spread of 10–15°F due to disagreements on cold air advection strength from an approaching upper trough, variable low-cloud persistence post-frontal passage, and southerly wind return timing, potentially limiting highs below climatological norms of 77–78°F. National Weather Service guidance emphasizes this model disparity, with new 00Z/12Z updates expected to refine probabilities before resolution based on official observations at Houston's major airports. Key differentiators include frontal boundary position and boundary-layer mixing efficiency.