Current National Weather Service forecast models indicate daytime highs in Houston will reach the upper 80s or higher on May 15, supported by persistent southerly flow and stable high-pressure conditions typical of late-spring patterns in southeast Texas. Climatological records show mid-May average highs near 85°F, with recent surface observations aligning with seasonal warming and no significant frontal passages expected. This consensus from official guidance drives the near-certain market-implied odds for 86°F or above. An unforecasted cold front or widespread cloud cover and heavy rain could reduce maximum temperatures, though model runs show low probability of such shifts before the observation window closes.