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SeaTac, USA Weather Averages

August is the hottest month in SeaTac with an average temperature of 19°C (65°F) and the coldest is December at 5°C (40°F). The wettest month is November with an average of 160mm of rain..

Average Temperature SeaTac

What is Average Temperature?
The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month
What is Average Temperature?
The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month

Average High Low Temperature SeaTac

What is Average High Low Temperature?
The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily
What is Average High Low Temperature?
The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily

Average Rainfall SeaTac

What is Average Rainfall?
The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years
What is Average Rainfall?
The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years

SeaTac : Next 24-Hour Weather

Today - 10th April 2025

Sunrise 06:29

Sunrise

Sunset 19:52

Sunset
0:00
Partly cloudy
12°C (54°F)
1:00
Cloudy
12°C (53°F)
2:00
Overcast
12°C (53°F)
3:00
Overcast
12°C (52°F)
4:00
Overcast
12°C (52°F)
5:00
Overcast
12°C (53°F)
6:00
Cloudy
12°C (53°F)
7:00
Overcast
12°C (53°F)
8:00
Overcast
13°C (55°F)
9:00
Overcast
15°C (57°F)
10:00
Cloudy
16°C (61°F)
11:00
Cloudy
18°C (64°F)
12:00
Partly cloudy
20°C (67°F)
13:00
Overcast
18°C (64°F)
14:00
Overcast
16°C (60°F)
15:00
Overcast
15°C (59°F)
16:00
Overcast
15°C (58°F)
17:00
Moderate rain
14°C (57°F)
18:00
Overcast
13°C (55°F)
19:00
Overcast
12°C (54°F)
20:00
Cloudy
12°C (52°F)
21:00
Overcast
11°C (51°F)
22:00
Overcast
10°C (49°F)
23:00
Patchy rain possible
9°C (47°F)
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