S
M
T
W
T
F
S
30
69°
50°
31
65°
50°
1
69°
57°
2
62°
55°
3
65°
56°
4
64°
56°
5
65°
53°
6
66°
55°
7
68°
51°
8
73°
50°
9
74°
51°
10
65°
55°
11
63°
51°
12
59°
54°
13
66°
53°
14
68°
51°
15
65°
49°
16
71°
47°
17
69°
55°
18
66°
48°
19
69°
50°
20
66°
50°
21
64°
52°
22
67°
48°
23
69°
51°
24
65°
52°
25
64°
51°
26
66°
50°
27
65°
51°
28
66°
50°
29
65°
49°
30
60°
49°
1
61°
47°
2
61°
49°
3
61°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Coos Bay
Coos Bay's September 2026 forecast shows daily high temperatures ranging from 60° to 71°, with overnight lows between 47° and 55°. The average high for September is 65° 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 Coos Bay. See also: October | November | December.
