S
M
T
W
T
F
S
30
61°
51°
31
66°
54°
1
70°
55°
2
71°
55°
3
70°
54°
4
62°
45°
5
62°
48°
6
63°
47°
7
67°
50°
8
64°
49°
9
63°
46°
10
64°
46°
11
63°
51°
12
62°
54°
13
61°
46°
14
61°
46°
15
62°
47°
16
61°
46°
17
62°
46°
18
65°
47°
19
69°
49°
20
68°
48°
21
64°
46°
22
63°
47°
23
59°
46°
24
60°
45°
25
58°
41°
26
59°
42°
27
59°
44°
28
61°
50°
29
65°
49°
30
65°
44°
1
Hist. Avg.
62°
44°
2
Hist. Avg.
62°
44°
3
Hist. Avg.
62°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Swartz Bay
Swartz Bay's September 2026 forecast shows daily high temperatures ranging from 58° to 71°, with overnight lows between 41° and 55°. The average high for September is 63° with an average low of 48°. 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 Swartz Bay. See also: October | November | December.
