S
M
T
W
T
F
S
30
66°
45°
31
65°
47°
1
66°
51°
2
67°
51°
3
66°
47°
4
67°
49°
5
69°
49°
6
64°
48°
7
69°
51°
8
69°
50°
9
68°
49°
10
68°
50°
11
67°
51°
12
68°
45°
13
67°
43°
14
67°
43°
15
59°
49°
16
65°
42°
17
66°
40°
18
58°
42°
19
59°
46°
20
64°
46°
21
62°
47°
22
62°
46°
23
Hist. Avg.
57°
42°
24
Hist. Avg.
57°
42°
25
Hist. Avg.
57°
42°
26
Hist. Avg.
56°
41°
27
Hist. Avg.
56°
41°
28
Hist. Avg.
56°
41°
29
Hist. Avg.
55°
40°
30
Hist. Avg.
55°
40°
1
Hist. Avg.
55°
40°
2
Hist. Avg.
54°
40°
3
Hist. Avg.
54°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Loon Bay
Loon Bay's September 2026 forecast shows daily high temperatures ranging from 58° to 69°, with overnight lows between 40° and 51°. The average high for September is 65° with an average low of 47°. 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 Loon Bay. See also: October | November | December.
