S
M
T
W
T
F
S
30
77°
55°
31
76°
56°
1
75°
62°
2
74°
63°
3
83°
62°
4
83°
63°
5
82°
58°
6
77°
54°
7
75°
58°
8
79°
54°
9
74°
52°
10
74°
53°
11
73°
52°
12
76°
52°
13
75°
58°
14
80°
53°
15
71°
51°
16
70°
55°
17
71°
54°
18
70°
56°
19
75°
48°
20
72°
51°
21
73°
49°
22
76°
48°
23
72°
48°
24
72°
47°
25
73°
53°
26
73°
54°
27
71°
55°
28
74°
54°
29
75°
45°
30
67°
49°
1
69°
54°
2
74°
52°
3
73°
46°
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 67° to 83°, with overnight lows between 45° and 63°. The average high for September is 74° with an average low of 54°. 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.
