SeaTac, WA Weather & Growing Conditions
This Afternoon
73°F
Sunny
Sunny, with a high near 73. Southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Sunny | 7 mph SW | 0% |
| Tonight | 53°F | Partly Cloudy | 5 mph SW | 0% |
| Saturday | 73°F | Partly Sunny | 0 to 5 mph WSW | 1% |
| Saturday Night | 53°F | Partly Cloudy | 6 mph N | 0% |
| Sunday | 73°F | Mostly Sunny | 3 to 8 mph N | 0% |
| Sunday Night | 53°F | Mostly Clear | 1 to 8 mph NNE | 0% |
| Monday | 71°F | Mostly Sunny | 1 to 6 mph NW | 0% |
| Monday Night | 54°F | Partly Cloudy | 5 mph NNE | 2% |
| Tuesday | 69°F | Partly Sunny | 3 mph N | 2% |
| Tuesday Night | 52°F | Partly Cloudy | 3 mph ENE | 2% |
| Wednesday | 68°F | Partly Sunny | 5 mph WNW | 3% |
| Wednesday Night | 53°F | Mostly Cloudy | 5 mph NNE | 6% |
| Thursday | 69°F | Partly Sunny then Slight Chance Light Rain | 2 to 6 mph N | 15% |
| Thursday Night | 54°F | Chance Light Rain | 6 mph S | 26% |
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 Sep 19, 2026.