S
M
T
W
T
F
S
30
70°
48°
31
73°
55°
1
75°
56°
2
71°
58°
3
76°
58°
4
77°
53°
5
79°
52°
6
70°
49°
7
67°
46°
8
72°
53°
9
74°
53°
10
75°
52°
11
74°
51°
12
70°
54°
13
73°
53°
14
75°
52°
15
70°
52°
16
67°
50°
17
64°
52°
18
67°
49°
19
72°
50°
20
66°
49°
21
70°
40°
22
63°
44°
23
62°
42°
24
68°
48°
25
70°
41°
26
66°
47°
27
64°
49°
28
63°
45°
29
65°
40°
30
60°
47°
1
65°
40°
2
67°
38°
3
57°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lagoon City
Lagoon City's September 2026 forecast shows daily high temperatures ranging from 57° to 79°, with overnight lows between 38° and 58°. The average high for September is 69° with an average low of 49°. 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 Lagoon City. See also: October | November | December.
