Seattle's highest temperature on August 3 is expected to settle in the mid-to-upper 70s°F as official National Weather Service and model guidance indicate moderate highs around 74–81°F amid typical early-August marine layer influence and onshore flow from the Pacific. This keeps conditions near or slightly below the 78°F historical average high for the date, despite NOAA's broader summer outlook favoring above-normal warmth across the Pacific Northwest. Recent forecast runs highlight limited intensification potential from weak high pressure, with any warming offset by coastal cooling effects and variable cloud cover. Traders assign the strongest implied odds (over 85% combined) to the 74–79°F bins because updated short-range models show no strong heat advection or clear-sky amplification expected through the period.