Weather in SeaTac, WA
SeaTac, Sunday, 25 October, 18:30
Partly cloudy. Feels like 49°. High 53°, low 45°.
Monthly outlook for SeaTac, WA: average high 53.3°, average low 44.1°. That is 0.4° above the climate normal for October. Precipitation is expected on 14 days (about 4.2 inches), against a normal of 9 days and 3.7 inches. The warmest day looks like 7 November (62.9°), the coolest 31 October (35.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 25 October – 3 November | 51.5° | 53.4° | -1.1° |
| 4 November – 13 November | 56.5° | 51.1° | +3° |
| 14 November – 23 November | at normal | 47.7° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Riverton (4 mi).
0.09
SeaTac, Monday, 26 October
Light rain. High 58°, low 47°.
0.31SeaTac, Tuesday, 27 October
Rain. High 53°, low 45°.
0.35SeaTac, Wednesday, 28 October
Rain. High 51°, low 42°.
0.74SeaTac, Thursday, 29 October
Rain. High 47°, low 38°.
0.22SeaTac, Friday, 30 October
Rain. High 48°, low 36°.
0.03SeaTac, Saturday, 31 October
Light rain. High 53°, low 36°.
0.06SeaTac, Sunday, 1 November
Light rain. High 48°, low 45°.
0
SeaTac, Monday, 2 November
Overcast. High 52°, low 39°.
0.12SeaTac, Tuesday, 3 November
Light rain. High 51°, low 40°.
0.46SeaTac, Wednesday, 4 November
Rain. High 48°, low 45°.
0.41SeaTac, Thursday, 5 November
Rain. High 63°, low 48°.
0.41SeaTac, Friday, 6 November
Rain. High 58°, low 50°.
0.07SeaTac, Saturday, 7 November
Light rain. High 63°, low 52°.
0.41SeaTac, Sunday, 8 November
Rain. High 58°, low 49°.
0.35SeaTac, Monday, 9 November
Light rain. High 49°, low 47°.
0.2
SeaTac, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.24SeaTac, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.26SeaTac, Thursday, 12 November
Climate normal for this date — 60-year average.
0.29SeaTac, Friday, 13 November
Climate normal for this date — 60-year average.
0.29SeaTac, Saturday, 14 November
Climate normal for this date — 60-year average.
0.24SeaTac, Sunday, 15 November
Climate normal for this date — 60-year average.
0.23SeaTac, Monday, 16 November
Climate normal for this date — 60-year average.
0.26SeaTac, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.18SeaTac, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.31SeaTac, Thursday, 19 November
Climate normal for this date — 60-year average.
0.23SeaTac, Friday, 20 November
Climate normal for this date — 60-year average.
0.24SeaTac, Saturday, 21 November
Climate normal for this date — 60-year average.
0.24SeaTac, Sunday, 22 November
Climate normal for this date — 60-year average.
0.33SeaTac, Monday, 23 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for SeaTac, WA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in SeaTac, WA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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