S
M
T
W
T
F
S
30
49°
42°
31
44°
39°
1
52°
29°
2
49°
25°
3
54°
46°
4
51°
44°
5
51°
41°
6
60°
44°
7
58°
43°
8
57°
38°
9
51°
37°
10
50°
37°
11
50°
34°
12
47°
35°
13
50°
31°
14
51°
32°
15
45°
29°
16
45°
28°
17
44°
33°
18
44°
33°
19
45°
32°
20
43°
33°
21
44°
32°
22
42°
28°
23
43°
33°
24
41°
27°
25
40°
23°
26
39°
21°
27
38°
22°
28
38°
25°
29
39°
20°
30
36°
19°
1
37°
29°
2
39°
29°
3
40°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lagoon
Lagoon's September 2026 forecast shows daily high temperatures ranging from 36° to 60°, with overnight lows between 19° and 46°. The average high for September is 46° with an average low of 32°. 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. See also: October | November | December.
