SeaTac, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for SeaTac, a city in King County, Washington.
Overnight
56°F
Clear
Clear, with a low around 56. North northeast wind around 7 mph.
7-day forecast for SeaTac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Clear | 7 mph NNE | 0% |
| Tuesday | 85°F | Sunny then Areas Of Smoke | 6 to 9 mph N | 0% |
| Tuesday Night | 60°F | Areas Of Smoke | 5 to 9 mph NNE | 0% |
| Wednesday | 90°F | Sunny then Patchy Smoke | 5 to 8 mph N | 0% |
| Wednesday Night | 61°F | Mostly Clear | 2 to 8 mph NNE | 0% |
| Thursday | 90°F | Sunny | 2 to 7 mph NW | 0% |
| Thursday Night | 62°F | Mostly Clear | 3 to 7 mph WSW | 0% |
| Friday | 87°F | Sunny | 6 mph SW | 0% |
| Friday Night | 60°F | Mostly Clear | 2 to 7 mph WNW | 0% |
| Saturday | 83°F | Sunny | 5 mph WSW | 0% |
| Saturday Night | 58°F | Mostly Clear | 2 to 7 mph NNW | 1% |
| Sunday | 78°F | Mostly Sunny | 5 mph WSW | 1% |
| Sunday Night | 57°F | Mostly Clear | 5 mph NW | 1% |
| Monday | 77°F | Mostly Sunny | 2 to 6 mph WNW | 1% |
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
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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 Aug 4, 2026.