September 2020 Weather History at Seattle-Tacoma International Airport Washington, United States

This report shows the past weather for Seattle-Tacoma International Airport, providing a weather history for September 2020. It features all historical weather data series we have available, including the Seattle-Tacoma International Airport temperature history for September 2020. You can drill down from year to month and even day level reports by clicking on the graphs.

Seattle-Tacoma International Airport Temperature History September 2020

Temperature history in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303040°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FAugOct
The daily range of reported temperatures (gray bars) and 24-hour highs (red ticks) and lows (blue ticks), placed over the daily average high (faint red line) and low (faint blue line) temperature, with 25th to 75th and 10th to 90th percentile bands.

Hourly Temperature in September 2020 at Seattle-Tacoma International Airport

Hourly Temperature in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOctcoldcoolwarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The hourly reported temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
Map
Marker
© OpenStreetMap contributors

Compare Seattle-Tacoma International Airport to another city:

Map

Cloud Cover in September 2020 at Seattle-Tacoma International Airport

Cloud Cover in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
no significant cloudno cloud detectedceiling and visibility ok
The hourly reported cloud coverage, categorized by the percentage of the sky covered by clouds.

Daily Precipitation in September 2020 at Seattle-Tacoma International Airport

Daily Precipitation in September 2020 at Seattle-Tacoma International Airport181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inAugOct
The daily measured quantity of liquid or liquid-equivalent precipitation.

Observed Weather in September 2020 at Seattle-Tacoma International Airport

Observed Weather in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
foghazedrizzlelight rainmoderate rainheavy rainfreezing rainsleetsnow grainslight snowmoderate snowheavy snowhailthunderstorm
The hourly observed weather, color coded by category (in order of severity). If multiple reports are present, the most severe code is shown.
DayObservationsPrecipitationCodes
Tue, Sep 8 SmokeFU
Wed, Sep 9 SmokeFU
Fri, Sep 11 Haze, SmokeHZ, FU
Sat, Sep 12 Haze, Mist, SmokeHZ, BR, FU
Sun, Sep 13 Haze, Mist, SmokeHZ, BR, FU
Mon, Sep 14 Light Rain, Haze, Mist, Smoke-RA, HZ, BR, FU
Tue, Sep 15 Light Rain, Haze, Mist, Smoke0.00 in-RA, HZ, BR, FU
Wed, Sep 16 Haze, Mist, SmokeHZ, BR, FU
Thu, Sep 17 Haze, Mist, SmokeHZ, BR, FU
Fri, Sep 18 Rain, Light Rain, Haze, Mist, Smoke0.26 inRA, -RA, HZ, BR, FU
Sat, Sep 19 Light Rain, Light Drizzle, Mist0.01 in-RA, -DZ, BR
Sun, Sep 20 Light Rain, Mist0.10 in-RA, BR
Mon, Sep 21 Patches of FogBCFG
Tue, Sep 22 Light Rain, Mist0.11 in-RA, BR
Wed, Sep 23 Rain, Light Rain, Mist1.08 inRA, -RA, BR
Thu, Sep 24 Light Rain0.08 in-RA
Fri, Sep 25 Rain, Light Rain, Mist0.69 inRA, -RA, BR

Hours of Daylight and Twilight in September 2020 at Seattle-Tacoma International Airport

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

Sunrise & Sunset with Twilight in September 2020 at Seattle-Tacoma International Airport

Sunrise & Sunset with Twilight in September 2020 at Seattle-Tacoma International Airport181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOct6:28 AM6:28 AMSep 17:48 PMSep 17:48 PM7:07 AM7:07 AMSep 306:49 PMSep 306:49 PM6:42 AM6:42 AMSep 117:28 PMSep 117:28 PM6:55 AM6:55 AMSep 217:07 PMSep 217:07 PM
The solar day over the course of September 2020. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Solar Elevation and Azimuth in September 2020 at Seattle-Tacoma International Airport

Solar Elevation and Azimuth in September 2020 at Seattle-Tacoma International AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOct001010202030304040500010102020303040
northeastsouthwest
Solar elevation and azimuth over the course of September 2020. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

Moon Rise, Set & Phases in September 2020 at Seattle-Tacoma International Airport

Moon Rise, Set & Phases in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctSep 110:23 PMSep 110:23 PMSep 174:01 AMSep 174:01 AMOct 12:06 PMOct 12:06 PM8:08 PM8:08 PM6:43 AM6:43 AM6:52 AM6:52 AM7:56 PM7:56 PM7:13 PM7:13 PM7:47 AM7:47 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Sep 2020IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
100%-5:37 AMWSW8:08 PMESE12:40 AMS246,425 mi
2
100%-6:43 AMWSW8:30 PMESE1:25 AMS248,266 mi
3
99%-7:49 AMW8:49 PME2:08 AMS249,842 mi
4
96%-8:53 AMW9:07 PME2:49 AMS251,064 mi
5
91%-9:56 AMW9:26 PME3:29 AMS251,826 mi
6
84%-11:00 AMWNW9:46 PMENE4:10 AMS252,020 mi
7
77%-12:03 PMWNW10:08 PMENE4:51 AMS251,548 mi
8
68%-1:08 PMWNW10:35 PMENE5:34 AMS250,337 mi
9
58%-2:13 PMWNW11:07 PMENE6:20 AMS248,357 mi
10
50%-3:16 PMNW11:47 PMNE7:08 AMS245,641 mi
11
38%-4:16 PMNW-8:00 AMS242,292 mi
12
28%12:38 AMNE5:09 PMNW-8:54 AMS238,496 mi
13
18%1:39 AMNE5:54 PMNW-9:50 AMS234,520 mi
14
10%2:50 AMENE6:32 PMWNW-10:46 AMS230,689 mi
15
4%4:08 AMENE7:04 PMWNW-11:41 AMS227,358 mi
16
1%5:29 AMENE7:31 PMWNW-12:34 PMS224,853 mi
17
0%6:52 AME7:56 PMW-1:27 PMS223,420 mi
18
3%8:14 AME8:20 PMW-2:20 PMS223,178 mi
19
9%9:37 AME8:46 PMWSW-3:13 PMS224,103 mi
20
17%10:59 AMESE9:14 PMWSW-4:07 PMS226,038 mi
21
27%12:20 PMESE9:47 PMWSW-5:04 PMS228,728 mi
22
39%1:38 PMESE10:26 PMSW-6:02 PMS231,880 mi
23
50%2:48 PMSE11:14 PMSW-7:01 PMS235,209 mi
24
61%3:48 PMSE--7:59 PMS238,478 mi
25
72%-12:10 AMSW4:37 PMSE8:55 PMS241,518 mi
26
81%-1:13 AMSW5:17 PMESE9:48 PMS244,229 mi
27
88%-2:20 AMWSW5:48 PMESE10:37 PMS246,564 mi
28
94%-3:27 AMWSW6:14 PMESE11:23 PMS248,512 mi
29
96%-4:34 AMWSW6:35 PMESE--
30
98%-5:39 AMW6:55 PME12:06 AMS250,079 mi

Humidity Comfort Levels in September 2020 at Seattle-Tacoma International Airport

Humidity Comfort Levels in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The hourly reported humidity comfort level, categorized by dew point. The shaded overlays indicate night and civil twilight.

Wind Speed in September 2020 at Seattle-Tacoma International Airport

Wind Speed in September 2020 at Seattle-Tacoma International Airport181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph10 mph10 mph20 mph20 mph30 mph30 mph40 mph40 mph50 mph50 mph60 mph60 mph70 mph70 mphAugOct
The daily range of reported wind speeds (gray bars), with maximum gust speeds (red ticks).

Hourly Wind Speed in September 2020 at Seattle-Tacoma International Airport

Hourly Wind Speed in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
0 mph calm 1 mph light air 4 mph light breeze 8 mph gentle breeze 13 mph moderate breeze 18 mph fresh breeze 25 mph strong breeze 31 mph near gale 39 mph gale 47 mph strong gale 55 mph storm 64 mph violent storm 73 mph hurricane force
The hourly reported wind speed, color coded into bands according to the Beaufort scale. The shaded overlays indicate night and civil twilight.

Hourly Wind Direction in 2020 at Seattle-Tacoma International Airport

Hourly Wind Direction in 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
calmnortheastsouthwest
The hourly reported wind direction, color coded by compass point. The shaded overlays indicate night and civil twilight.

Atmospheric Pressure in September 2020 at Seattle-Tacoma International Airport

Atmospheric Pressure in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303029.6 inHg29.6 inHg29.8 inHg29.8 inHg30.0 inHg30.0 inHg30.2 inHg30.2 inHg30.4 inHg30.4 inHg30.6 inHg30.6 inHgAugOct
The daily range of atmospheric pressure (gray bars), as measured by the altimeter setting reported in e.g. a METAR report.

Number of Reports by Day in September 2020 at Seattle-Tacoma International Airport Fall 2020

Number of Reports by Day in September 2020 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030002020404060608080AugOct
regularspecialcorrection
The number of reports per day.

Reports by Hour in September 2020 at Seattle-Tacoma International Airport Fall 2020

Reports by Hour in September 2020 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
regularspecialcorrection
Indication of what types of reports were recorded during each hour.

This report graphically illustrates the historical weather reports recorded by the weather station at Seattle-Tacoma International Airport in September 2020.

METAR Reports

Airport weather stations throughout the world routinely issue METAR weather reports . Such reports are used by pilots, air traffic controllers, meteorologists, climatologists, and other researchers. They are published via radio transmission and on the internet. We have been collecting and archiving published METAR reports since 2011, and have found third-party sources for archived reports from years prior to that.

ISD Reports

The Integrated Surface Database (ISD), maintained and published by NOAA's National Center for Environmental Information , consists of hourly and synoptic weather reports from a variety of sources. We use ISD data to complement and backfill for our METAR archive.

Other Data

The sources for the averages shown in the daily temperature chart are discussed in greater detail on this station's Averages Report.

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.