Planning to spend July in Seattle? See what the weather is actually like, day by day. Actual past weather, made for future travelers. Seattle in July averages 25°C during the day and 14°C at night. This is the driest month of the year, and part of the summer season. Dry conditions dominate this month. A great time for outdoor fun and exploration. On average, there are about 4 days with rain during this month, averaging 14 mm. July stands out as the hottest month in Seattle, with temperatures reaching an average high of 75.9°F (24.4°C). Clear skies, along with extended daylight, mean that sunshine is abundant. Low rainfall characterizes this month, making it an ideal period for outdoor activities. Seattle weather in July: average high 22.9°C, low 12.8°C, 25 mm rainfall, plus records, trends and year-by-year history from NASA POWER data since 1981. Discover the sunny and warm July weather in Seattle, with detailed charts for temperature, rainfall, cloud cover, humidity, daylight, and wind. Seattle in July rewards travelers with average highs of 25°C and overnight lows around 14°C. Expect around 6 rainy days, making it one of the drier periods in the city. With 13 daily sunshine hours on average, conditions are comfortable for sightseeing at a relaxed pace. What is the weather like in Seattle in July? In July, Seattle averages a 77 °F (24.9 °C) daytime high and a 58 °F (14.6 °C) overnight low, with about 0.4 in (9.7 mm) of precipitation over the month, roughly 12.8 hours of sunshine a day and relative humidity near 66%. Seattle weather by month: average high and low temperature, rainfall, rainy days and hours of sunshine for every month, from 30 years of data (1996–2025), plus record highs and lows. Explore our comprehensive guide to Seattle's July weather, featuring detailed insights on temperature ranges, humidity levels, daily sunshine duration, and crucial UV Index information. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Seattle.