TODAY DEC18
TEMPERATURE52
HUMIDITY86
PRESSURE101020
WIND COND.150 18.4
  • 5339Wed40%20%
  • 5244Thu50%60%
  • 5445Fri20%20%
  • 5445Sat
  • 5146Sun
daynightWeather update from Boeing Field - King County International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in South Lake Union for August is 67.5 degrees
  • The lowest monthly average temperature in South Lake Union for December is 41.4 degrees
  • The most monthly precipitation in South Lake Union occurs in November with 6.6 inches
  • The air quality index in South Lake Union is 7% worse than the national average
  • The pollution index in South Lake Union is 60% better than the national average

Compare Seattle, WA Weather

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      South Lake Union Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January36°F49°F42°F5.1"
      February37°F52°F44°F3.8"
      March40°F55°F47°F4.9"
      April43°F61°F51°F3.1"
      May49°F68°F57°F2.2"
      June54°F72°F62°F1.5"
      July58°F79°F67°F0.4"
      August58°F79°F68°F0.6"
      September54°F73°F62°F1.6"
      October47°F62°F54°F3.9"
      November40°F53°F47°F6.6"
      December36°F48°F41°F6.1"

      South Lake Union air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexSouth Lake UnionSeattleWashington
      Air quality index454536
      Pollution index1,081,4301,081,4304,541,850

      South Lake Union air quality

      MeasurementTotal
      Days measured365
      Days with good air quality236
      Days with moderate air quality127
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.010%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly South Lake Union temperature with heat index

      South Lake Union monthly precipitation with daily maximum

      South Lake Union monthly snow depth with daily maximum

      South Lake Union monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Bethel, WA4,1821864.0%
      Lofall, WA2,1191864.0%
      Southworth, WA2,3001864.0%
      Navy Yard City, WA2,9731864.0%
      Burley, WA2,5151864.0%
      Seattle, WA741,2514510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Brampton, ON735,754n/a 
      Mississauga, ON764,342n/a 
      Denver, CO715,8785816.0%
      Winnipeg, MB775,440n/a 
      Washington, DC701,974476.0%
      Seattle, WA741,2514510.0%
      Source: The South Lake Union, Seattle, WA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.