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Weather in Seattle
Seattle has a west coast temperate marine climate with wet and chilly days throughout most of the year, so bring an umbrella or rain jacket when you visit.
Spring (March to May) is pleasant with flowers in peak bloom and the big crowds are yet to arrive. This is a good time to visit Seattle. Time your visit with the Seattle Restaurant Week and a comedy event called Moisture Festival.
Summer (June to August) is high season, with local residents and tourists go to parks and festivals and make the most of the sunshine. Expect higher accommodation prices and book in advance.
Autumn (September to November) sees temperatures decline from 21°C (70°F) to 10°C (50°F) over a couple months. The acclaimed Bumbershoot festival takes place over the Memorial Day weekend in September, plus major theatre and dance companies also kick start their annual season.
Winter (December to March) is generally wet and dreary, though the lively Seattle Winterfest (November and December) helps and there are other indoor events to compensate too. The average high temperature in January is 7°C (45°F) so wrap up warm.
Night
| Weather (night) | Temp (min night) | Rain (mm) | Wind (mph) | Humidity Pressure Visibility | ||
|---|---|---|---|---|---|---|
| Sun |
Clear
|
Clear skies |
1 6 °C |
0mm |
5
nne |
70%
1,018mb Good |
| Mon |
Clear
|
Clear skies |
1 8 °C |
0mm |
3
ne |
64%
1,011mb Good |
| Tue |
Clear
|
Clear skies |
1 8 °C |
0mm |
2
s |
68%
1,012mb Good |
| Wed |
Clear
|
Clear skies |
1 7 °C |
0mm |
5
ssw |
84%
1,015mb Good |
| Thu |
Clear
|
Clear skies |
1 6 °C |
0mm |
3
ssw |
82%
1,016mb Good |
| Fri |
Cloudy
|
Cloudy skies |
1 7 °C |
0mm |
4
ssw |
85%
1,014mb Good |
| Sat |
Partly Cloudy Night
|
Partly cloudy skies |
1 6 °C |
0mm |
4
sw |
88%
1,014mb Good |
| Sun |
Clear
|
Clear skies |
1 6 °C |
0.1mm |
4
sw |
69%
1,015mb Good |
| Mon |
Cloudy
|
Cloudy skies |
1 5 °C |
0.1mm |
6
s |
74%
1,019mb Good |
Last updated at 04:06, Tuesday 27 August
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Last updated: We update the weather data for Seattle from our weather partner every four hours. The time the last update was received is detailed here.
Actual Forecast Location: We have 830+ weather locations on the worldtravelguide.net website. Where no exact location is available we have used the nearest appropriate forecast point.
Symbols indicate the predominant weather for the day in question, calculated based on a weighting of different types of weather. So if a day is forecast to be sunny with the possibility of a brief shower, then we will see a sunny or partly cloudy symbol rather than a rain cloud. For the purpose of this forecast, 'day' is the entire 24 our period 00:00 to 23:59
The maximum temperature is the highest temperature forecast between dawn and dusk, and the minimum temperature is the lowest temperature expected from dusk on the day in question to dawn the next day. The temperature is in °C, or Celsius.
Wind speed and direction are the conditions expected at midday. Wind direction is based on a 16 point compass. W, SW, SSW, etc. The wind direction states where the wind originates. Wind speed is listed in MPH or miles per hour.
Humidity levels indicates how much water vapour the air contains compared to the maximum it could contain at that temperature. As a general guide:
- 0 to 30 is very low
- 31 to 50 is low
- 51 to 70 is moderate to low
- 71 to 80 is moderate
- 81 to 90 is moderate to high
- 91 to 100 is high
Pressure is measured in millibars (mb)
Visibility based on whether the human eye can see the following distances:
- Very poor - less than 1km
- Poor - between 1km and 4km
- Moderate - between 4km and 10km
- Good - between 10km and 20km
- Very good - between 20km and 40km
- Excellent - more than 40km
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