S
M
T
W
T
F
S
30
92°
65°
31
94°
71°
1
94°
69°
2
93°
68°
3
94°
70°
4
94°
71°
5
93°
71°
6
93°
70°
7
92°
68°
8
87°
70°
9
86°
69°
10
90°
70°
11
92°
69°
12
92°
69°
13
91°
68°
14
91°
68°
15
90°
67°
16
84°
62°
17
83°
60°
18
83°
64°
19
89°
60°
20
81°
59°
21
80°
61°
22
80°
62°
23
81°
64°
24
87°
64°
25
87°
63°
26
88°
63°
27
87°
61°
28
86°
60°
29
85°
59°
30
85°
59°
1
84°
58°
2
86°
60°
3
Hist. Avg.
81°
56°
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 80° to 94°, with overnight lows between 58° and 71°. The average high for September is 88° with an average low of 65°. 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.
