Cool
Average highs are around 16°C, so pack for cooler days.
Weather Guide
Seattle, Washington, United States Average Monthly Weather
Weather score33Poor annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 15°C, sunshine averages 5.8h per day, and rainfall totals about 989mm. Sea temperatures average 10°C across the year.
Annual weather
Annual averages
Temp
15°C
Rain
989mm
Annual total
Sun
5.8h
Sea
10°C
Weather score
33
Poor avg
Seasonal climate calendar
Trip feel
Showers
Rainfall averages 87mm, so some wet days are possible.
Limited sun
Sunshine averages 4.5h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 10°C, so the water can feel cool.
Map
Weather map
Compare Seattle, Washington, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
October16°C average high
October is close to Seattle's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
October87mm average rain
October sits near Seattle's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsApril to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
October4.5 hours average sun
October is below Seattle's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
October10°C average sea
October is close to Seattle's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaJune to September
Sea temperatures are usually near 11°C in this stretch, so swimming comfort is at its strongest.
Weather score
October26 weather score
October scores below Seattle's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
