what is the hottest month in seattle
Graph of average and extreme temperature ranges by day for Seattle, WA. The warmest month in Seattle Tacoma International, Seattle, Washington is July with an average high temperature of 77.0Â°F. The hottest day on record was July 30 2009 when the temperature hit 102.9Â°F. During January the overnight temperature drops to an average of 34.7Â°F with the lowest temperature of 0.3Â°F being recorded on January 31 1950.