S
M
T
W
T
F
S
30
74°
50°
31
73°
50°
1
69°
51°
2
67°
51°
3
71°
50°
4
66°
46°
5
68°
47°
6
69°
49°
7
66°
48°
8
65°
47°
9
66°
48°
10
65°
42°
11
64°
41°
12
65°
42°
13
65°
41°
14
64°
43°
15
65°
47°
16
62°
44°
17
Hist. Avg.
58°
45°
18
Hist. Avg.
58°
45°
19
Hist. Avg.
58°
45°
20
Hist. Avg.
58°
45°
21
Hist. Avg.
57°
45°
22
Hist. Avg.
57°
45°
23
Hist. Avg.
57°
44°
24
Hist. Avg.
57°
44°
25
Hist. Avg.
57°
44°
26
Hist. Avg.
56°
44°
27
Hist. Avg.
56°
44°
28
Hist. Avg.
56°
44°
29
Hist. Avg.
56°
43°
30
Hist. Avg.
56°
43°
1
Hist. Avg.
55°
43°
2
Hist. Avg.
55°
43°
3
Hist. Avg.
55°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mill Bay
Mill Bay's September 2026 forecast shows daily high temperatures ranging from 62° to 74°, with overnight lows between 41° and 51°. The average high for September is 67° with an average low of 47°. 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 Bay. See also: October | November | December.
