Official observational data from Environment and Climate Change Canada stations, including Toronto Pearson Airport and Toronto City, recorded a daily maximum of 20°C on October 9, 2026, with hourly readings peaking at that level during the afternoon under mostly clear skies and light winds. This aligns with the market-implied odds showing near-certain consensus on 20°C, as verified measurements from authoritative monitoring networks outweigh pre-event forecasts projecting a 19°C high. Historical October averages near 16°C provide context, but the specific day's synoptic conditions supported the observed peak. Resolution could shift only in the unlikely event of post-processing revisions to the official daily maximum or selection of an alternate station with divergent readings.