S
M
T
W
T
F
S
30
79°
59°
31
78°
58°
1
77°
56°
2
77°
52°
3
76°
50°
4
77°
51°
5
75°
49°
6
67°
48°
7
66°
51°
8
66°
56°
9
65°
56°
10
65°
52°
11
66°
47°
12
64°
50°
13
64°
53°
14
65°
50°
15
64°
48°
16
63°
47°
17
65°
49°
18
69°
54°
19
73°
50°
20
72°
48°
21
67°
44°
22
62°
44°
23
62°
47°
24
63°
45°
25
60°
44°
26
61°
45°
27
61°
48°
28
62°
47°
29
60°
46°
30
60°
45°
1
61°
49°
2
64°
52°
3
67°
48°
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 60° to 79°, with overnight lows between 44° and 59°. The average high for September is 67° 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 Keyport. See also: October | November | December.
