October weather forecastSeattle, WA
October
Weather in October
October is characterized by cooler temperatures as Seattle enters the heart of the fall season. Rain returns in slightly greater quantity, but warm and sunny days are still quite typical. This month brings a spectacular display of fall foliage, as leaves turn into vibrant shades of red, orange, and gold. The anticipation of Halloween and the enchanting change in scenery creates a whimsical atmosphere in the city. Despite the shortening days, October retains a unique charm amplified by the colorful arrival of fall.Temperature
With October's onset, the weather shows a temperature decrease, transitioning from an agreeable 69.6°F (20.9°C) in September to a moderate 58.6°F (14.8°C). During October, the average low-temperature is a chilly 45.3°F (7.4°C).Humidity
The average relative humidity in October in Seattle, Washington, is 79%.Rainfall
In Seattle, during October, the rain falls for 7.2 days and regularly aggregates up to 0.51" (13mm) of precipitation. Throughout the year, there are 84.2 rainfall days, and 5.2" (132mm) of precipitation is accumulated.Snowfall
In Seattle, snow does not fall in April through October and December.Ocean temperature
In Seattle, in October, the average water temperature is 50.9°F (10.5°C).Note: Swimming in 50.9°F (10.5°C) at temperatures under 50°F (10°C) requires thermal swimsuits; otherwise, one can face cold shock and breathing difficulty. Even brief immersion at 55.4°F (13°C) feels frosty.
Daylight
In October, the average length of the day is 10h and 50min.On the first day of October, sunrise is at 7:09 am and sunset at 6:47 pm. On the last day of the month, sunrise is at 7:53 am and sunset at 5:52 pm PDT.
Sunshine
The average sunshine in October is 5.6h.UV index
The average daily maximum UV index in October is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 3 during October leads to these advisories:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
Seattle, WA
- Average high temperature in October: 58.6°F
The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in October: 45.3°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.1°F).
Average pressure in October
Seattle, WA
- Average pressure in October: 30.04"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in October
Seattle, WA
- Average wind speed in October: 4.4mph
The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in October
Seattle, WA
- Average humidity in October: 79%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in October
Seattle, WA
- Average rainfall in October: 0.51"
The wettest month (with the highest rainfall) is December (0.87").
The driest months (with the least rainfall) are July and August (0.12").
Average rainfall days in October
Seattle, WA
- Average rainfall days in October: 7.2 days
The month with the highest number of rainy days is November (9.1 days).
The month with the least rainy days is August (2.8 days).
Average snowfall in October
Seattle, WA
- Average snowfall in October: 0"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in October
Seattle, WA
- Average snowfall days in October: 0 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in October
Seattle, WA
- Average sea temperature in October: 50.9°F
The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).
Average daylight in October /
Average sunshine in October
Seattle, WA
- Average daylight in October: 10h and 48min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in October: 5h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in October
Seattle, WA
- Average sunshine days in October: 21.1 days
The month with the most sunshine days is August (25.9 days).
The month with the least sunshine days is November (16.8 days).
Average UV index in October
Seattle, WA
- Average UV index in October: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in October
Seattle, WA
- Average cloud cover in October: 41
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in October
Seattle, WA
- Average visibility in October: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).
