Best year time to visit SeaTac

General weather information about SeaTac

Average annual temperature is 11.5 °C

Absolute maximum temperature: 34.4 °C

Absolute minimum temperature: -4.8 °C

Number of sunny days: 168 days

Number of rainy days: 195 days

Number of snow days: 2 days

Look at detailed online map of SeaTac

* Weather data for SeaTac United States is based on climate observations for 2026 year

SeaTac air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.913.416.523.129.230.031.334.428.526.115.714.9
Average daytime temperature (°C)8.68.010.812.620.923.027.727.922.216.410.410.0
Average temperature (°C)5.54.35.77.914.916.220.220.915.911.66.97.1
Average night temperature (°C)3.31.82.34.710.211.313.815.612.08.44.34.8
Absolute minimum temperature (°C)-4.7-4.8-2.50.57.28.211.811.78.6-1.3-2.1-0.3

SeaTac monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.010.012.014.015.015.015.014.013.011.010.08.0
Daylight mean duration (h)9.010.311.913.615.115.915.514.212.610.99.38.5
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.08.08.0
Sunshine mean duration (h)3.95.17.56.810.911.513.211.38.56.75.23.1
Precipitation (mm)11278831732633534112103179262
Sunny days41097212026201316148
Rainy days26172223101051117151623
Snow days110000000000

SeaTac - weather forecast by months

SeaTac weather in januarySeaTac weather in februarySeaTac weather in marchSeaTac weather in aprilSeaTac weather in maySeaTac weather in juneSeaTac weather in julySeaTac weather in augustSeaTac weather in septemberSeaTac weather in octoberSeaTac weather in novemberSeaTac weather in december

Best time to visit SeaTac:

The best time to visit SeaTac during the most sunny months:

  • May — 10.9(h)
  • June — 11.5(h)
  • July — 13.2(h)
  • August — 11.3(h)

Months with the longest average daylight duration in SeaTac:

  • June — 15.9(h)
  • July — 15.5(h)

The largest precipitation sum in SeaTac is at

  • April — 173(mm)
  • November — 179(mm)
  • December — 262(mm)

    • Weather forecast in the closest to SeaTac admin centers

    Weather forecast in the closest towns to SeaTac

    Explore SeaTac

    See also
    MapTrains schedule
    Plan your trip
    AccommodationExperiencesBlog

    Frequently asked questions

    When is the best time to visit SeaTac?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit SeaTac.
    What is the weather like in SeaTac?
    See average temperature, rainfall and daylight hours for SeaTac by month in the table above.
    How many sunny days does SeaTac have?
    The monthly weather statistics above show sunshine and rainfall patterns for SeaTac throughout the year.