S
M
T
W
T
F
S
30
78°
65°
31
82°
71°
1
84°
72°
2
82°
70°
3
78°
67°
4
76°
63°
5
75°
63°
6
75°
62°
7
77°
69°
8
82°
62°
9
74°
61°
10
75°
60°
11
76°
58°
12
72°
60°
13
72°
60°
14
71°
59°
15
73°
60°
16
74°
59°
17
72°
59°
18
75°
60°
19
72°
58°
20
71°
56°
21
70°
57°
22
70°
57°
23
72°
61°
24
75°
57°
25
76°
61°
26
76°
62°
27
69°
59°
28
69°
58°
29
74°
55°
30
72°
54°
1
67°
56°
2
71°
62°
3
73°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mill Basin
Mill Basin's September 2026 forecast shows daily high temperatures ranging from 67° to 84°, with overnight lows between 52° and 72°. The average high for September is 74° with an average low of 61°. 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 Basin. See also: October | November | December.
