S
M
T
W
T
F
S
30
65°
50°
31
66°
52°
1
66°
50°
2
66°
48°
3
68°
46°
4
64°
47°
5
66°
52°
6
66°
52°
7
Hist. Avg.
62°
52°
8
Hist. Avg.
61°
52°
9
Hist. Avg.
61°
51°
10
Hist. Avg.
61°
51°
11
Hist. Avg.
61°
51°
12
Hist. Avg.
60°
51°
13
Hist. Avg.
60°
50°
14
Hist. Avg.
60°
50°
15
Hist. Avg.
60°
50°
16
Hist. Avg.
60°
49°
17
Hist. Avg.
59°
49°
18
Hist. Avg.
59°
49°
19
Hist. Avg.
59°
49°
20
Hist. Avg.
58°
48°
21
Hist. Avg.
58°
48°
22
Hist. Avg.
58°
48°
23
Hist. Avg.
58°
47°
24
Hist. Avg.
57°
47°
25
Hist. Avg.
57°
47°
26
Hist. Avg.
57°
46°
27
Hist. Avg.
56°
46°
28
Hist. Avg.
56°
46°
29
Hist. Avg.
56°
45°
30
Hist. Avg.
55°
45°
1
Hist. Avg.
55°
45°
2
Hist. Avg.
55°
45°
3
Hist. Avg.
55°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Southern Harbour
Southern Harbour's September 2026 forecast shows daily high temperatures ranging from 64° to 68°, with overnight lows between 46° and 52°. The average high for September is 66° with an average low of 50°. 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 Southern Harbour. See also: October | November | December.
