SeaTac, WA Weather & Growing Conditions
Overnight
57°F
Clear
Clear, with a low around 57. North northeast wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Clear | 8 mph NNE | 0% |
| Tuesday | 84°F | Sunny then Areas Of Smoke | 8 to 12 mph N | 0% |
| Tuesday Night | 60°F | Areas Of Smoke | 6 to 10 mph NNE | 0% |
| Wednesday | 90°F | Sunny then Patchy Smoke | 6 to 10 mph N | 0% |
| Wednesday Night | 61°F | Clear | 3 to 9 mph N | 0% |
| Thursday | 89°F | Sunny | 2 to 8 mph NW | 0% |
| Thursday Night | 62°F | Mostly Clear | 8 mph W | 0% |
| Friday | 86°F | Sunny | 7 mph SW | 0% |
| Friday Night | 61°F | Mostly Clear | 2 to 7 mph NW | 0% |
| Saturday | 83°F | Sunny | 2 to 6 mph WSW | 0% |
| Saturday Night | 59°F | Mostly Clear | 2 to 7 mph NNE | 1% |
| Sunday | 78°F | Mostly Sunny | 5 mph WSW | 1% |
| Sunday Night | 58°F | Mostly Clear | 5 mph NNW | 1% |
| Monday | 77°F | Mostly Sunny | 6 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for SeaTac, WA
Last spring frost
Mar 2
First fall frost
Nov 23
Growing season
266 days
Hardiness zone
9a
Explore more for SeaTac, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Seattle Tacoma Intl Ap, Wa (0.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.