S
M
T
W
T
F
S
30
89°
64°
31
93°
70°
1
93°
66°
2
92°
65°
3
93°
69°
4
93°
69°
5
92°
68°
6
92°
69°
7
91°
68°
8
86°
68°
9
85°
67°
10
89°
68°
11
91°
67°
12
90°
67°
13
90°
66°
14
89°
66°
15
89°
65°
16
87°
64°
17
82°
60°
18
82°
63°
19
88°
59°
20
80°
57°
21
79°
59°
22
79°
59°
23
80°
62°
24
85°
62°
25
86°
61°
26
86°
61°
27
85°
60°
28
84°
58°
29
83°
57°
30
82°
57°
1
83°
56°
2
84°
60°
3
76°
52°
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 76° to 93°, with overnight lows between 52° and 70°. The average high for September is 87° with an average low of 63°. 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.
