Seatac, Washington, United States Climate

Weather: 11.73°C/53.11°F, Wind SW at 5.14 km/h, 73% Humidity, 0.29% Chance of rain

United States
(Photo by History in HD on Unsplash)
Contents

SeaTac Climate Summary

Located at an elevation of 109.37 meters (358.83 feet) above sea level, SeaTac has a Mediterranean, warm summer climate (Classification: Csb). The district’s yearly temperature is 12.64ºC (54.75ºF) and it is 0.0% lower than United States’s averages. SeaTac typically receives about 83.82 millimeters (3.3 inches) of precipitation and has 150.64 rainy days (41.27% of the time) annually.

CountryUnited States
CityWashington
Longitude-122.2960726
Latitude47.4435903
Attitude/Elevation109.37m (358.83ft)
Local timeThursday 00:13
Annual high temperature15.8ºC (60.44ºF)
Annual low temperature6.94ºC (44.49ºF)
Average annual precip.83.82mm (3.3in)
Warmest monthAugust (26.65ºC / 79.97ºF)
Coldest MonthDecember (2.1ºC / 35.78ºF)
Wettest MonthNovember (126.76mm / 4.99in)
Driest MonthJuly (21.39mm / 0.84in)
Number of days with rainfall (≥ 1.0 mm)150.64 days (41.27%)
Days with no rain214.36 days (58.73%)
Humidity77.61%

Climate SeaTac: Weather By Month

MonthJanFebMarAprMayJunJulAugSepNovOctDecYear
Record high °C (°F)15.0(59.0)17.0(62.6)26.0(78.8)30.0(86.0)32.0(89.6)35.0(95.0)39.0(102.2)39.0(102.2)37.0(98.6)30.0(86.0)22.0(71.6)14.0(57.2)39.0(102.2)
Average high °C (°F)7.62(45.72)8.16(46.69)10.98(51.76)13.89(57.0)19.05(66.29)21.48(70.66)26.28(79.3)26.65(79.97)22.56(72.61)16.1(60.98)9.99(49.98)6.86(44.35)15.8(60.44)
Daily mean °C (°F)5.34(41.61)5.66(42.19)8.06(46.51)10.8(51.44)15.74(60.33)18.19(64.74)22.22(72.0)22.22(72.0)18.42(65.16)12.77(54.99)7.57(45.63)4.68(40.42)12.64(54.75)
Average low °C (°F)2.5(36.5)2.15(35.87)3.49(38.28)5.05(41.09)7.8(46.04)9.61(49.3)12.52(54.54)13.56(56.41)11.81(53.26)8.18(46.72)4.45(40.01)2.1(35.78)6.94(44.49)
Record low °C (°F)-8.0(17.6)-10.0(14.0)-3.0(26.6)-3.0(26.6)-2.0(28.4)2.0(35.6)4.0(39.2)5.0(41.0)4.0(39.2)-1.0(30.2)-11.0(12.2)-8.0(17.6)-11.0(12.2)
Average precipitation mm (inches)121.03(4.76)96.9(3.81)107.55(4.23)91.43(3.6)67.23(2.65)52.22(2.06)21.39(0.84)30.75(1.21)57.58(2.27)107.85(4.25)126.76(4.99)125.15(4.93)83.82(3.3)
Average precipitation days (≥ 1.0 mm)16.5514.9117.1815.3612.2710.04.824.8210.0913.6416.015.012.55
Average relative humidity (%)84.4284.1481.478.6773.8672.9268.1968.7373.1578.1282.8284.9377.61
Mean monthly sunshine hours6.216.299.3911.9513.0813.3413.713.4211.397.286.356.079.87

Climate Graph

The chart below shows the mean monthly temperature and precipitation of SeaTac in recent years.

SeaTac

SeaTac Temperature by Month

July
22.22°C | 72.0°F
August
22.22°C | 72.0°F
September
18.42°C | 65.16°F
June
18.19°C | 64.74°F
May
15.74°C | 60.33°F
October
12.77°C | 54.99°F
April
10.8°C | 51.44°F
March
8.06°C | 46.51°F
November
7.57°C | 45.63°F
February
5.66°C | 42.19°F
January
5.34°C | 41.61°F
December
4.68°C | 40.42°F

Historical Data

Summary
  • 2020
  • 2019
  • 2018
  • 2017
  • 2016
  • 2015
  • 2014
  • 2013
  • 2012
  • 2011
  • 2010
  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December
TemperatureMaxAverageMin
Max Temperature14.0°C (57.2°F)7.42°C (45.36°F)1.0°C (33.8°F)
Avg Temperature9.0°C (48.2°F)4.94°C (40.89°F)0.0°C (0°F)
Min Temperature5.0°C (41.0°F)2.0°C (35.6°F)-3.0°C (26.6°F)
Dew PointMaxAverageMin
Dew Point7.0°C (44.6°F)1.32°C (34.38°F)-8.0°C (17.6°F)
PrecipitationMaxAverageMinSum
Precipitation30.1mm | 1.19in4.02mm | 0.16in0.0mm | 0in124.7mm | 4.91in
Snowdepth4.8mm | 0.19in0.25mm | 0.01in0.0mm | 0in7.6mm | 0.3in
WindMaxAverageMin
Wind13.0kmh | 8.08mph5.94kmh | 3.69mph2.0kmh | 1.24mph
Gust Wind20.0kmh | 12.43mph9.42kmh | 5.85mph4.0kmh | 2.49mph
Sea Level PressureMaxAverageMin
Sea Level Pressure30.1mb4.02mb0.0mb
SeaTac

Daily Observations

TimeTemperatureDew PointHumidityWind SpeedPressurePrecipitation
December° C | ° F° C | ° F%Kph | MphHg | MbTotal (mm/in)
2017-12-017 | 44.63 | 37.48310 | 6.2130.03 | 10170.7 | 0.03
2017-12-026 | 42.84 | 39.2935 | 3.1129.91 | 101312.3 | 0.48
2017-12-035 | 41.03 | 37.4923 | 1.8630.15 | 10212.8 | 0.11
2017-12-044 | 39.21 | 33.8874 | 2.4930.53 | 10340.0 | 0.0
2017-12-054 | 39.21 | 33.8838 | 4.9730.59 | 10360.0 | 0.0
2017-12-068 | 46.43 | 37.4767 | 4.3530.65 | 10380.0 | 0.0
2017-12-079 | 48.24 | 39.2734 | 2.4930.59 | 10360.0 | 0.0
2017-12-085 | 41.0-1 | 30.2713 | 1.8630.53 | 10340.0 | 0.0
2017-12-096 | 42.8-1 | 30.2662 | 1.2430.47 | 10320.0 | 0.0
2017-12-107 | 44.60 | 32.0684 | 2.4930.45 | 10310.0 | 0.0
2017-12-117 | 44.6-0 | 32.0633 | 1.8630.45 | 10310.0 | 0.0
2017-12-126 | 42.8-2 | 28.4623 | 1.8630.45 | 10310.0 | 0.0
2017-12-136 | 42.83 | 37.4846 | 3.7330.45 | 10310.4 | 0.02
2017-12-147 | 44.62 | 35.6774 | 2.4930.36 | 10280.0 | 0.0
2017-12-155 | 41.03 | 37.4884 | 2.4930.21 | 10236.8 | 0.27
2017-12-165 | 41.03 | 37.4934 | 2.4930.3 | 10260.3 | 0.01
2017-12-177 | 44.65 | 41.08913 | 8.0830.09 | 10196.6 | 0.26
2017-12-187 | 44.67 | 44.6949 | 5.5930.0 | 101618.0 | 0.71
2017-12-196 | 42.84 | 39.29013 | 8.0829.65 | 100422.4 | 0.88
2017-12-204 | 39.21 | 33.8816 | 3.7330.18 | 10222.5 | 0.1
2017-12-212 | 35.6-1 | 30.2813 | 1.8630.39 | 10290.6 | 0.02
2017-12-222 | 35.60 | 32.0865 | 3.1130.27 | 10255.8 | 0.23
2017-12-231 | 33.8-6 | 21.2638 | 4.9730.47 | 10320.0 | 0.0
2017-12-241 | 33.8-8 | 17.6556 | 3.7330.33 | 10271.7 | 0.07
2017-12-250 | 32.0-1 | 30.2943 | 1.8630.3 | 10266.0 | 0.24
2017-12-261 | 33.8-2 | 28.4913 | 1.8630.33 | 10270.0 | 0.0
2017-12-272 | 35.6-0 | 32.0913 | 1.8630.3 | 10260.5 | 0.02
2017-12-286 | 42.85 | 41.09610 | 6.2130.09 | 10195.6 | 0.22
2017-12-298 | 46.47 | 44.69511 | 6.8429.88 | 101230.1 | 1.19
2017-12-306 | 42.84 | 39.28610 | 6.2130.15 | 10211.6 | 0.06
2017-12-313 | 37.40 | 32.0857 | 4.3530.3 | 10260.0 | 0.0

SeaTac 11 Year Historical Weather Data

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