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Jul 18, 2022 · September sees the warmest average sea temperatures for the water around Seattle. The average sea temperature in Seattle during the month of September is 53°F. These aren’t precisely swimming temperatures, but you can still go kayaking with proper clothing to keep you warm.
- Caitlin Lloyd
- Travel Editor
September Weather in Seattle Washington, United States. Daily high temperatures decrease by 8°F, from 75°F to 67°F, rarely falling below 59°F or exceeding 83°F. Daily low temperatures decrease by 5°F, from 57°F to 51°F, rarely falling below 45°F or exceeding 61°F.
Feb 14, 2024 · In Seattle, the average seawater temperature in September is 53.2°F (11.8°C). Note: Dipping into 53.2°F (11.8°C) below 50°F (10°C) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 55.4°F (13°C) feels cold to the bone.
- September temperatures in Seattle vary between a high-temperature of 69.6°F and a low-temperature of 50.5°F .
- The average relative humidity in September is 75% .
- In Seattle, Washington, during September, the rain falls for 6 days and regularly aggregates up to 0.28" of precipitation .
- April through October and December are months without snowfall .
- In Seattle, in September, the average water temperature is 53.2°F . Swimming in 53.2°F is considered dangerous. Unprotected immersion in tempera...
- In Seattle, Washington, the average day length in September is 12h and 33min .
- In September, on the first day of the month, sunrise is at 6:28 am and sunset at 7:50 pm . On the last day of the month, sunrise is at 7:...
- The average sunshine duration in September in Seattle, Washington, is 9.4h .
- The average daily maximum UV index in September in Seattle is 4 . A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe...
The average temperature in Seattle in September for a typical day ranges from a high of 71°F (22°C) to a low of 52°F (11°C). Some would describe it as mildly cool, humid but cool. For comparison, the hottest month in Seattle, August, has days with highs of 77°F (25°C) and lows of 56°F (13°C).
Temperatures above 90 °F (32 °C) are unusual here during September. The thermometer dips to 50 °F (10 °C) or below on an average of 8 nights. But September does not normally get as cold as 40 °F (4 °C). Rain. Half the time, Seattle receives 0.8 to 2.1 inches (20 to 54 mm) of rainfall in September.
The warm season lasts for 2.8 months, from June 20 to September 12, with an average daily high temperature above 72°F. The hottest month of the year in Seattle is August, with an average high of 77°F and low of 58°F. The cool season lasts for 3.6 months, from November 11 to February 29, with an average daily high temperature below 53°F.
Currently: 58 °F. Overcast. (Weather station: Seattle Boeing Field, USA). See more current weather. Select month: September 2021 Weather in Seattle — Graph. °F. Sun, Sep 26. Lo:54. 12 am. Hi:57. 11. Lo:55. 6 am. Hi:63. 11. Lo:57. 12 pm. Hi:63. 4. Lo:57. 6 pm. Hi:61. 9. Mon, Sep 27. Lo:57. 12 am. Hi:61. 12. Lo:55. 6 am.
