S
M
T
W
T
F
S
30
86°
67°
31
N/A
1
84°
60°
2
83°
61°
3
86°
69°
4
90°
70°
5
86°
65°
6
84°
61°
7
78°
63°
8
77°
59°
9
78°
55°
10
73°
51°
11
73°
50°
12
77°
56°
13
74°
56°
14
76°
56°
15
76°
55°
16
73°
52°
17
74°
55°
18
74°
55°
19
72°
52°
20
74°
54°
21
75°
55°
22
75°
55°
23
74°
54°
24
75°
55°
25
74°
54°
26
75°
54°
27
74°
53°
28
74°
53°
29
73°
52°
30
73°
54°
1
72°
54°
2
73°
52°
3
72°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Haven
South Haven's September 2026 forecast shows daily high temperatures ranging from 72° to 90°, with overnight lows between 50° and 70°. The average high for September is 76° with an average low of 56°. 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 South Haven. See also: October | November | December.
