Seattle Forecast: Cooler Marine Air Keeps Highs Below Average
Seattle is expected to experience cooler-than-average temperatures on August 28, 2026, with highs ranging between 69–72 °F (20.5–22.2 °C), according to National Weather Service and private model guidance. Morning cloud cover will gradually clear in the afternoon, aided by light southwesterly winds. These conditions are attributed to cooler marine air and limited early-day sunlight. Observations early in the day show temperatures in the low 60s °F (15–16 °C), with only modest warming anticipated. This forecast is slightly below the climatological average high of 75 °F (23.9 °C) for this date, based on 1991–2020 data. 
