SeaTac, WA Weather & Growing Conditions
Today
57°F
Partly Sunny
Partly sunny. High near 57, with temperatures falling to around 53 in the afternoon. North wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 57°F | Partly Sunny | 6 mph N | 3% |
| Tonight | 42°F | Partly Cloudy | 0 to 5 mph ESE | 3% |
| Wednesday | 57°F | Partly Sunny then Slight Chance Light Rain | 6 mph S | 17% |
| Wednesday Night | 49°F | Light Rain | 6 to 14 mph S | 94% |
| Thursday | 58°F | Slight Chance Light Rain then Partly Sunny | 7 to 12 mph SSW | 16% |
| Thursday Night | 48°F | Light Rain | 9 mph S | 77% |
| Friday | 57°F | Light Rain | 5 to 12 mph S | 77% |
| Friday Night | 48°F | Chance Light Rain | 5 mph S | 44% |
| Saturday | 61°F | Chance Light Rain | 3 mph S | 31% |
| Saturday Night | 50°F | Light Rain Likely | 3 to 16 mph S | 72% |
| Sunday | 57°F | Light Rain Likely | 5 to 16 mph SSW | 72% |
| Sunday Night | 45°F | Slight Chance Light Rain | 5 mph SSE | 21% |
| Monday | 57°F | Chance Light Rain | 5 mph SSE | 52% |
| Monday Night | 48°F | Light Rain Likely | 5 to 9 mph SSE | 70% |
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 Nov 4, 2026.