Recent forecasts for Denver on September 18 indicate scattered thunderstorms and variable cloud cover that limit daytime solar heating, keeping projected highs mostly in the upper 70s to low 80s. Official guidance from the National Weather Service and local models shows peaks near 78–83°F amid a post-frontal airmass with moderate moisture, consistent with the market’s near-even distribution across the 80–85°F bins. Thunderstorm timing and coverage introduce the main uncertainty, as earlier or more widespread storms could suppress temperatures toward the lower leading outcomes while clearer intervals allow brief warming. Historical September averages near 78°F provide context, but the current setup favors modest suppression relative to peak late-summer values. Updated model runs and afternoon observations will refine these probabilities ahead of market resolution.