S
M
T
W
T
F
S
30
77°
68°
31
80°
67°
1
81°
65°
2
76°
61°
3
75°
62°
4
76°
65°
5
76°
64°
6
77°
65°
7
78°
62°
8
76°
62°
9
76°
60°
10
77°
60°
11
76°
62°
12
77°
64°
13
78°
62°
14
79°
61°
15
77°
67°
16
77°
67°
17
74°
66°
18
75°
67°
19
75°
67°
20
76°
66°
21
75°
67°
22
78°
67°
23
78°
66°
24
79°
67°
25
81°
67°
26
81°
66°
27
80°
64°
28
79°
63°
29
79°
65°
30
78°
66°
1
79°
67°
2
82°
66°
3
81°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harbor Gateway
Harbor Gateway's September 2026 forecast shows daily high temperatures ranging from 74° to 82°, with overnight lows between 60° and 68°. The average high for September is 78° with an average low of 65°. 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 Harbor Gateway. See also: October | November | December.
