Temperature
49 F at 3 AM; 67 F at its warmest, 3 PM Thursday, and 49 F at its coolest, 2 AM.
- Now
- 49F
- 3 AM
- Highest
- 67F
- 3 PM Thursday
- Lowest
- 49F
- 2 AM
How it is measured: Stevenson screen and siting, Field Book FB-INS-009
Airports/Washington/Seattle-Tacoma International Airport
Seattle-Tacoma International Airport, Washington
Large airport in King County, Washington50°
73°/52°
Partly cloudy·
Feels like 50°·Light air 1 mph ESE
Coming up. Rain is likely late tonight, from about 4 AM, the chance peaking at 63% around 5 AM.
Now. Seattle-Tacoma International Airport is 50° and partly cloudy at 4 AM. The dew point is 48°, so the air feels dry and comfortable. Light air from the east-southeast at 1 mph.
Today and tonight. It warms to about 71° by 3 PM. Tonight falls to about 57° by 1 AM, with some cloud. Air quality is moderate (index 54): fine for most people, though people unusually sensitive to air pollution may feel it outdoors.
The week. The warmest day ahead is tomorrow, near 62°, and the coolest Sunday, near 58°. Rain is possible Thursday (32%).
The sky tonight. The sun sets at 6:20 PM. The Moon is a waxing crescent, 34% lit, and sets at 9:56 PM. The next full Moon is Sunday, Oct 25. After dark, look for Saturn, bright in the east-southeast. A planet shines with a steady light where the stars around it twinkle. The Orionids meteor shower is active, peaking around Oct 21: at its peak, up to about 20 meteors an hour can be seen from a dark site. The day is 10 hours 52 minutes long, 3 minutes shorter than yesterday.
0UV Low
54Air quality
97%Humidity
58%Cloud
Now
4:00 AM
50feels50
now, partly cloudy
Today
Oct 16
7352
63%
Sat
Oct 17
6254
29%
15mph
Sun
Oct 18
5845
partly cloudy day
Mon
Oct 19
5845
partly cloudy day
Tue
Oct 20
5945
clear day
Wed
Oct 21
6043
mostly clear day
Thu
Oct 22
5846
32%
50°
73°52°
62°54°
58°45°
58°45°
59°45°
60°43°
58°46°
As of 4:00 AM in Seattle-Tacoma International Airport, Washington.
Air quality
The air at Seattle-Tacoma International Airport
Index 54, moderate, led by fine particles. Read at 3 AM from its reporting area, Seattle-Bellevue-Kent Valley (WA), 8 miles off.
54Moderate
- Fine particles (PM2.5)54Moderate-
- Ozone2Good1 ppb8.2 mi
- Coarse particles (PM10)19Good-
- Nitrogen dioxide10Good11.1 ppb7.7 mi
- Sulfur dioxide0Good0.9 ppb8.2 mi
- Carbon monoxide-0.2 ppm8.2 mi
The days ahead
Good each day through Sat Oct 17, led by fine particles. Yesterday measured 53, moderate.
GoodModerate
- 53YesterdayOct 15
- 33TodayOct 16
- 33SatOct 17
Smoke, the next 44 hours
Little smoke near the ground through Sat 11 PM: the index from smoke stays at 17 or under.
Precipitation
What has fallen at Seattle-Tacoma International Airport
None in the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.
- Last 24 hours
- 0.00in
- Last 3 days
- 0.00in
Visibility
How far you can see at Seattle-Tacoma International Airport, the next 44 hours
Mist or haze: visibility falls to 2 miles Sat 4 AM.
F
Now, today, and the week
Weather instrument stations by state
Airfield
- Code
- SEA
- ICAO
- KSEA
- IATA
- SEA
- Field elevation
- 433 ft
- Serves
- Seattle
- Kind
- Large airport
- Scheduled service
- Yes
- Its own instrument
- SEA
- Wind now
- Calm, read 16 Oct, 02:53
Runways
| Runway | Length | Width | Surface | Heading, true | Wind along it now | Crosswind now |
|---|---|---|---|---|---|---|
| 16C / 34C | 9,426 ft | 150 ft | Asphalt and concrete | 180° / 0° | Calm | Calm |
| 16L / 34R | 11,901 ft | 150 ft | Asphalt and concrete | 180° / 0° | Calm | Calm |
| 16R / 34L | 8,500 ft | 150 ft | Asphalt and concrete | 180° / 0° | Calm | Calm |
Measured here
What the airfield's own instrument measured, the last 24 hours
Every hour from Seattle-Tacoma INTL (SEA), Seattle-Tacoma International Airport's own instrument, measure by measure, on the field's own clock.
Humidity and dew point
A dew point of 47 F, the air 93% saturated; the humidity ran from 56% at 3 PM Thursday to 100% at 5 AM Thursday.
- Dew point now
- 47F
- 3 AM
- Humidity now
- 93%
- Humidity, range
- 56 to 100%
How it is measured: Humidity variables, Field Book FB-WAT-002
Wind
1 mph from the west southwest at 3 AM; at its strongest 10 mph, 7 AM Thursday, and no gust reported.
- Now
- 1mph
- from the west southwest
- Strongest
- 10mph
- 7 AM Thursday
- Highest gust
- -
- none reported
How it is measured: Coriolis as geometry, Field Book FB-ENG-008
Pressure
30.21 inHg at 3 AM, falling 0.04 inHg over 3 hours; 0.18 inHg lower than a day before.
- Now
- 30.21inHg
- 3 AM
- 3 hours
- -0.04inHg
- falling
- 24 hours
- -0.18inHg
How it is measured: Hydrostatic balance, Field Book FB-ENG-003
Visibility
Down to 0.1 miles at 5 AM Thursday, under a mile for 5 hours; 10 miles or more now.
- Now
- 10+mi
- Lowest
- 0.1mi
- 5 AM Thursday
- Hours under a mile
- 5
How it is measured: Fog types, Field Book FB-WAT-020
Cloud base
The lowest cloud base came down to 100 ft at 5 AM Thursday; a base was reported in 22 of the hours.
- Lowest base now
- -
- Lowest in 24 hours
- 100ft
- 5 AM Thursday
- Hours with a base reported
- 22
How it is measured: Cloud classification, Field Book FB-SKY-001
Precipitation
None measured in the gauge in the last 24 hours.
- Last 24 hours
- 0.00in
- Wettest hour
- -
- Hours with some
- 0
How it is measured: ASOS, Field Book FB-INS-002
Seattle-Tacoma INTL: every reading, the last 7 days, 30 days and the year, and how well it reports
What is measuring near here
The 5 instruments nearest Seattle-Tacoma International Airport, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.
measured now3 instruments
At an airfield/0.3 mi away/449 ft/16 ft above here
temp, wind, gust, visibility, precip, pressure
S144Th TukwilaT144T
Beside a road/2.6 mi away/144 ft/289 ft below here
temp, pavement temp, wind, visibility, precip
Spring Brook Ck Nr OrilliaSBKW1
At a river or reservoir gauge/4.1 mi away/23 ft/410 ft below here
temp, wind, gust, humidity, pressure
measured daily2 instruments
Des Moines 2.3 NNWWA-KG-318
In a volunteer observer's own ground/1.8 mi away/336 ft/97 ft below here
precip, snowfall, snow depth
Tacoma No. 1TACW1
At a cooperative observer's station/14.7 mi away/6 ft/427 ft below here
snowfall, snow depth, precip, high, low
What the snow tracker reads here
Every instrument in this state
-
Snow on the ground
Elsewhere in Washington
23 places, each with its own forecast and its own instruments.
BellinghamcityBluewoodski areaCrystal Mountainsurveyed ski areaEverettcityLeavenworthcityLoup Loupski areaMount RainierfeatureMt. Bakersurveyed ski areaNorth Cascades National ParkfeatureOlympiacityOlympic MountainsfeaturePuget SoundfeatureSeattlecitySnoqualmie PassfeatureSpokanecityStevens PassfeatureStevens Passsurveyed ski areaTacomacityThe Summit at Snoqualmiesurveyed ski areaWenatcheecityWhite Passski areaWinthroptownYakimacity
Near Seattle-Tacoma International Airport
The nearest places, each with its own forecast and the instruments nearest it.
- SeaTaccity, 1 mi
- Normandy Parkcity, 2 mi
- Tukwilacity, 2 mi
- Buriencity, 2 mi
- Des Moinescity, 4 mi
- Bryn Mawr-Skywaycommunity, 4 mi
- Boulevard Parkcommunity, 4 mi
- White Centercommunity, 4 mi
- Rentoncity, 6 mi
- Kentcity, 7 mi
- Vashoncommunity, 7 mi
- Lakeland Northcommunity, 8 mi
Airports near Seattle-Tacoma International Airport
- Renton Municipal AirportRNT, 5 mi
- King County International Airport - Boeing FieldBFI, 5 mi
- Kenmore Air Harbor Seaplane BaseW55, 13 mi
- Tacoma Narrows AirportTIW, 18 mi
- Kenmore Air Harbor LLC Seaplane BaseS60, 21 mi
- Bremerton National AirportPWT, 21 mi
- McChord Air Force BaseTCM, 23 mi
- Pierce County-Thun FieldPLU, 24 mi