S
M
T
W
T
F
S
30
95°
71°
31
95°
70°
1
94°
71°
2
93°
70°
3
89°
65°
4
88°
66°
5
87°
70°
6
88°
69°
7
88°
69°
8
90°
70°
9
94°
70°
10
89°
69°
11
90°
68°
12
90°
69°
13
92°
66°
14
92°
62°
15
86°
62°
16
85°
63°
17
86°
62°
18
87°
65°
19
90°
67°
20
91°
66°
21
91°
67°
22
86°
66°
23
86°
66°
24
85°
65°
25
85°
64°
26
88°
62°
27
89°
64°
28
88°
64°
29
89°
63°
30
89°
63°
1
88°
62°
2
89°
63°
3
88°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Port Gibson
Port Gibson's September 2026 forecast shows daily high temperatures ranging from 85° to 95°, with overnight lows between 56° and 71°. The average high for September is 89° with an average low of 66°. 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 Port Gibson. See also: October | November | December.
