**NWS and private forecasts for Denver on August 27 center on a high near 90°F under mostly sunny skies with only a 20% chance of afternoon thunderstorms.** Official guidance from the National Weather Service Denver-Boulder office calls for a maximum around 90°F, with light winds and limited moisture limiting widespread convection. Private models show a similar envelope of 87–92°F, reflecting modest spread in how much daytime heating occurs before any storms develop. The market’s near-even split between the 90–91°F (41%) and 88–89°F (38%) bins captures the key uncertainty: whether full insolation and dry downslope flow push the mercury to the low 90s or whether earlier or stronger thunderstorms cap the peak in the upper 80s. Denver’s high elevation (~5,280 ft) and typically low humidity allow rapid afternoon temperature rises, but any convective cloud cover or outflow boundaries can shave several degrees off the maximum. With no major model shifts in the past 24 hours and only isolated storm potential, traders are essentially pricing the narrow range between near-full heating and modest convective interference.