Forecast models from the National Weather Service and other agencies converge on a high near 89–91°F for Denver on August 27, with mostly sunny skies, light winds shifting northwest, and only a 20% chance of isolated afternoon thunderstorms. This narrow range creates the near-even split between the 88–89°F and 90–91°F bins, as small differences in cloud timing, boundary-layer mixing, or storm development can shift the daily peak by 1–2°F. Historical late-August averages near 82–85°F provide context, while current dew points in the 50s and high pressure support efficient daytime heating at Denver’s mile-high elevation. Updated model runs tomorrow morning will refine the exact maximum before the market resolves.