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Hourly Forecast
Daylight Hours
06:55
Sunrise
19:11
Sunset
Moon
Waxing Crescent
13:27
Moonrise
20:52
Moonset
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Weather in SeaTac today, September 16, 2026
Expect a mostly clear day in SeaTac on September 16, 2026, with sunshine dominating from morning through evening. Cloud should stay limited, so the overall feel remains bright and settled. The morning looks comparatively open, with cloud near 0% around 02:00. Early outdoor plans have a better chance of staying dry and bright.
The day peaks near 24°C and cools toward 11°C. The air stays humid, with relative humidity between 41% and 90% and the peak around 05:00. Expect gentle winds, highest near 17:00 at 4.5 km/h.
Later hours favour clearer intervals, as cloud stays near 5% around 22:00. The afternoon is the better half for outdoor time. Horizontal visibility holds close to 16.1 km. Sunrise is at 06:55 and sunset at 19:11, giving 12 hours 15 minutes of sunlight today.
In short, September 16, 2026 looks like a fine day in SeaTac for being outside, peaking around 24°C.
Frequently asked questions about weather in SeaTac
How warm does it get in SeaTac?
The warmest month in SeaTac is August, with average high temperatures of 25°C. The average temperature during this period is around 19°C.
How cold does it get in SeaTac?
The coldest month in SeaTac is February, with average low temperatures of 3°C. The average temperature during this period is around 5°C.
What is the wettest time of year in SeaTac?
The wettest month in SeaTac is December, with an average of 204mm of precipitation.
What is the driest time of year in SeaTac?
The driest month in SeaTac is July, with an average of 17mm of precipitation.
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