S
M
T
W
T
F
S
27
65°
48°
28
64°
46°
29
63°
53°
30
65°
49°
1
68°
51°
2
71°
52°
3
67°
54°
4
69°
51°
5
68°
52°
6
66°
52°
7
67°
53°
8
67°
51°
9
58°
50°
10
58°
45°
11
60°
43°
12
62°
42°
13
63°
50°
14
64°
50°
15
69°
49°
16
74°
53°
17
62°
48°
18
60°
49°
19
59°
47°
20
57°
46°
21
57°
47°
22
58°
47°
23
59°
46°
24
60°
48°
25
57°
43°
26
61°
44°
27
60°
44°
28
60°
48°
29
59°
43°
30
59°
48°
31
54°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in SeaTac
SeaTac's October 2026 forecast shows daily high temperatures ranging from 54° to 74°, with overnight lows between 42° and 53°. The average high for October is 61° with an average low of 47°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in SeaTac. See also: November | December | January.
