S
M
T
W
T
F
S
30
80°
61°
31
79°
71°
1
85°
70°
2
77°
70°
3
86°
72°
4
88°
65°
5
82°
64°
6
77°
63°
7
81°
61°
8
78°
59°
9
79°
62°
10
82°
61°
11
80°
62°
12
81°
61°
13
79°
58°
14
78°
59°
15
74°
59°
16
74°
61°
17
75°
55°
18
72°
53°
19
71°
53°
20
72°
56°
21
76°
60°
22
79°
60°
23
80°
59°
24
79°
58°
25
77°
56°
26
77°
57°
27
78°
58°
28
77°
58°
29
78°
56°
30
71°
52°
1
67°
51°
2
70°
54°
3
75°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Keyport
Keyport's September 2026 forecast shows daily high temperatures ranging from 67° to 88°, with overnight lows between 51° and 72°. The average high for September is 77° with an average low of 59°. 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 Keyport. See also: October | November | December.
