Forecast models from the National Weather Service and private sources converge on sunny skies and light northerly winds allowing daytime highs in Seattle to reach the mid-to-upper 80s on August 5, driven by a warm air mass and strong solar heating under clear conditions. This positions 86–87°F as the leading market outcome at 42% implied probability, followed by 88–89°F at 27%, consistent with current observations showing temperatures already climbing above the early-August average of 79°F. A lingering heat dome and above-normal seasonal outlook further support elevated readings, though marine influence or any late-day cloud cover could cap the peak near 85°F. Traders appear to weigh the latest model runs heavily, with limited downside risk below 84°F given the established warming trend.