For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Guard yourself - An obligation to protect skin and eyes from harm exists. Note: An average UV index of 4 in September transforms into this advice: A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals. UV indexIn Seattle, Washington, the average daily maximum UV index in September is 4. SunshineIn September, the average sunshine in Seattle is 9.4h. On the last day of September, sunrise is at 7:07 am and sunset at 6:51 pm PDT. On the first day of the month, sunrise is at 6:28 am and sunset at 7:50 pm. DaylightIn Seattle, the average length of the day in September is 12h and 33min. A short span at 55.4☏ without it is tough. Note: You can swim in 53.2☏ below 50☏ with proper thermal wear failing that, the cold shock and respiratory challenges are nearly certain. Ocean temperatureIn Seattle, in September, the average water temperature is 53.2☏. SnowfallIn Seattle, snow does not fall in April through October and December. In Seattle, during the entire year, the rain falls for 84.2 days and collects up to 5.2" of precipitation. Rainfall In Seattle, during September, the rain falls for 6 days and regularly aggregates up to 0.28" of precipitation. HumidityIn September, the average relative humidity in Seattle, Washington, is 75%. During the month of September, Seattle's nighttime temperature lowers to an average of 50.5☏. TemperatureThe shift from August to September in Seattle coincides with a small decrease in the average high-temperature, down to an agreeable 69.6☏ from a moderately hot 76.3☏. Seattle becomes an excellent destination for those seeking the vibrant palette of fall foliage. Early fall brings an explosion of autumn hues in the city’s parks and outdoor spaces. Despite the weather being mostly pleasant, the onset of autumn introduces a fresh gust of breezy conditions. Days begin to shorten and temperatures start to cool off after the summer’s heat, but the city continues to enjoy fairly sunny and dry conditions. brings you the most accurate monthly weather forecast for Chicago, IL with average/record and high/low temperatures, precipitation and more. September in Seattle marks the transition from summer to fall, with a gradual drop in temperature.
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