S
M
T
W
T
F
S
30
65°
49°
31
67°
57°
1
72°
58°
2
75°
51°
3
77°
56°
4
75°
48°
5
66°
50°
6
67°
54°
7
72°
56°
8
65°
51°
9
64°
53°
10
63°
54°
11
64°
53°
12
63°
52°
13
63°
51°
14
65°
53°
15
72°
55°
16
72°
48°
17
67°
47°
18
66°
47°
19
71°
52°
20
70°
55°
21
65°
47°
22
62°
48°
23
60°
48°
24
61°
45°
25
61°
45°
26
62°
46°
27
61°
54°
28
60°
53°
29
61°
48°
30
61°
51°
1
66°
53°
2
63°
50°
3
62°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mill Creek
Mill Creek's September 2026 forecast shows daily high temperatures ranging from 60° to 77°, with overnight lows between 45° and 58°. The average high for September is 66° with an average low of 51°. 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 Mill Creek. See also: October | November | December.
