S
M
T
W
T
F
S
30
67°
51°
31
70°
56°
1
66°
54°
2
66°
51°
3
67°
50°
4
69°
55°
5
66°
51°
6
65°
50°
7
65°
50°
8
67°
49°
9
73°
56°
10
73°
58°
11
72°
55°
12
73°
58°
13
74°
58°
14
67°
48°
15
69°
49°
16
68°
54°
17
72°
56°
18
73°
51°
19
72°
55°
20
71°
53°
21
63°
55°
22
70°
56°
23
71°
51°
24
69°
53°
25
69°
57°
26
70°
57°
27
70°
55°
28
61°
52°
29
59°
49°
30
59°
52°
1
58°
49°
2
57°
45°
3
56°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mukilteo
Mukilteo's September 2026 forecast shows daily high temperatures ranging from 56° to 74°, with overnight lows between 45° and 58°. The average high for September is 67° with an average low of 53°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Mukilteo. See also: October | November | December.
