S
M
T
W
T
F
S
30
81°
65°
31
N/A
1
84°
72°
2
89°
69°
3
83°
69°
4
82°
69°
5
81°
68°
6
80°
63°
7
76°
61°
8
75°
63°
9
80°
62°
10
76°
59°
11
76°
58°
12
79°
63°
13
79°
62°
14
77°
63°
15
78°
62°
16
78°
63°
17
77°
62°
18
77°
62°
19
78°
64°
20
78°
64°
21
77°
63°
22
78°
63°
23
78°
62°
24
77°
63°
25
78°
62°
26
78°
60°
27
77°
61°
28
76°
61°
29
75°
60°
30
75°
59°
1
74°
59°
2
75°
60°
3
75°
60°
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 74° to 89°, with overnight lows between 58° and 72°. The average high for September is 78° with an average low of 63°. 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.
