Seattle Weather in October

October shifts from dry summer to rainy winter weather at Seattle, Washington. The city gets a moderate amount of rain, along with mild temperatures this month.

This page gives detailed information on the typical October temperature, precipitation, sun, humidity, wind and storms for Seattle. The weather measurements are averages based on climate data gathered at Seattle — Tacoma International Airport, located south of the city center.

Temperature Weather iconTemperature

61 °F October average high 16 °C
47 °F October average low 8 °C
14 days 60 °F max. or more (16 °C)
25 days 50 °F min. or less (10 °C)

Nearly every October day warms to over 50 degrees Fahrenheit (10 degrees Celsius) in Seattle. The city averages 2 days this month when the thermometer reaches into the 70s °F (over 21 °C). A temperature of 80 °F (27 °C) or above occurs just once a decade during October.

The thermometer dips to 40 °F (4 °C) or below on an average of 3 nights. But most years October doesn't cool down to freezing.

Rainy Weather iconRain

3.9 in total precipitation 99 mm
14 days of rain

Half the time, Seattle receives 2.5 to 5.1 inches (63 to 130 mm) of rainfall in October. One in four years has drier weather, while another one in four is wetter. None of the precipitation normally falls as snow.

Sunny Weather iconSun

37 % sunshine
5 days clear skies

The sun's rays reach the ground in Seattle during 37 percent of daylight hours on average in October, for a total of 124 hours in the month. Typically on 5 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in October at Seattle lasts for 10 hours and 49 minutes a day on average. The longest day of the month is the 1st with 11 hours and 39 minutes of daylight. By the end of the month, the days have shortened to 10:00 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

79 % October average humidity

The relative humidity in Seattle during October usually peaks at 87 percent in the morning then drops to 67 percent by late afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 84 87 87 79 68 67 76 81

Windy Weather iconWind

8.3 mph October wind speed average 13.4 kph

October is less windy than most other months in Seattle.

Stormy Weather iconStorms

3 days rainfall of 0.5 inches (13 mm) or more
0 day with thunderstorms in October

Seattle gets an October thunderstorm on an average of once every few years.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

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