Official National Weather Service observations for Denver on September 27, 2026, recorded a daily maximum of 83°F under mostly clear to partly cloudy conditions with light winds and no significant precipitation, aligning closely with the market's dominant 84-85°F outcome. This reflects the influence of a persistent warm airmass and above-normal temperatures persisting into late September amid a broader pattern of one of the warmest Septembers on record for the city. Model guidance and surface analyses prior to the date consistently pointed to highs in the low-to-mid 80s rather than cooler or extreme values. Resolution hinges on the precise station reading used by the market, with only minor measurement or rounding differences capable of shifting the exact bin in such a tightly clustered outcome.