SeaTac, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for SeaTac, a city in King County, Washington.
Tonight
53°F
Mostly Clear
Mostly clear, with a low around 53. North wind around 3 mph.
7-day forecast for SeaTac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Mostly Clear | 3 mph N | 0% |
| Sunday | 73°F | Mostly Sunny | 1 to 6 mph N | 0% |
| Sunday Night | 52°F | Partly Cloudy | 1 to 6 mph N | 0% |
| Monday | 71°F | Partly Sunny | 1 to 5 mph N | 0% |
| Monday Night | 54°F | Partly Cloudy | 5 mph NNE | 1% |
| Tuesday | 69°F | Mostly Cloudy | 5 mph WNW | 1% |
| Tuesday Night | 53°F | Mostly Cloudy | 3 mph SSW | 6% |
| Wednesday | 68°F | Partly Sunny | 5 mph SSW | 8% |
| Wednesday Night | 52°F | Mostly Cloudy | 5 mph N | 11% |
| Thursday | 64°F | Partly Sunny then Slight Chance Light Rain | 2 to 7 mph NNE | 18% |
| Thursday Night | 51°F | Slight Chance Light Rain | 2 to 7 mph N | 19% |
| Friday | 63°F | Slight Chance Light Rain | 2 to 8 mph N | 19% |
| Friday Night | 49°F | Mostly Cloudy | 7 mph NE | 14% |
| Saturday | 65°F | Partly Sunny | 5 to 8 mph N | 7% |
Forecast source: National Weather Service (api.weather.gov) for SeaTac (47.443, -122.298). Updated through the day.
Growing snapshot for SeaTac
Last spring frost
Mar 2
First fall frost
Nov 23
Growing season
266 days
Hardiness zone
9a
More local growing data for SeaTac: nearby ZIP 98158 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Algona
Ames Lake
Auburn
Baring
Beaux Arts Village
Bellevue
Black Diamond
Bothell
Boulevard Park
Bryn Mawr-Skyway
Burien
Carnation
Clyde Hill
Cottage Lake
Covington
Des Moines
Duvall
East Renton Highlands
Fairwood
Fall City
Federal Way
Greenwater
High Bridge
Hobart
Hunts Point
Index
Issaquah
Kenmore
Kent
Kirkland
Climate data from the nearest NOAA station, Seattle Tacoma Intl Ap, Wa (0.5 mi from SeaTac). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.