Seattle Weather in October

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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 weather for Seattle. You can jump directly to data and descriptions for:

The temperature, precipitation and sunshine numbers here are historical averages based on climate data gathered at Seattle's Husky Stadium, located near downtown Seattle at the University of Washington on the shore of Lake Washington's Union Bay. The rest of the measurements are averages from the Seattle - Tacoma International Airport, located south of the city center.

temperature iconTemperature

61 °F October average high 16 °C
47 °F October average low 8 °C

In most years, Seattle averages a daily maximum temperature for October that's between 59 and 62 degrees Fahrenheit (15 to 17 degrees Celsius). The minimum temperature usually falls between 45 and 48 °F (7 to 9 °C).

The days at Seattle cool most quickly during October. By the end of the month, the temperature has dropped around 10 °F (5 °C) below what it was at the start.

16 days 60 °F maximum or above (16 °C)
23 days 50 °F minimum or below (10 °C)

Nearly every October day warms to over 50 °F (10 °C) 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 2 nights. But only rarely does October drop to freezing.

precipitation iconRain

3.4 inches total October precipitation 86 millimetres
13 days of rain

Half the time, Seattle receives 2 to 5 inches (52 to 127 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.

sunshine iconSun

37 % sunshine in October
5 days with 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.

humidity 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

wind iconWind

8.3 mph October wind speed average 13.4 kph

October is less windy than most other months in Seattle.

lightning cloud iconStorms

2 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.

Reference

These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

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