S
M
T
W
T
F
S
30
64°
50°
31
63°
50°
1
62°
49°
2
63°
50°
3
63°
51°
4
64°
50°
5
63°
51°
6
62°
48°
7
64°
50°
8
69°
53°
9
70°
55°
10
71°
56°
11
71°
56°
12
70°
55°
13
70°
55°
14
67°
50°
15
65°
53°
16
65°
55°
17
70°
54°
18
71°
55°
19
70°
54°
20
70°
54°
21
69°
53°
22
70°
54°
23
70°
53°
24
69°
54°
25
69°
54°
26
70°
53°
27
70°
53°
28
64°
52°
29
63°
52°
30
65°
51°
1
63°
49°
2
60°
45°
3
59°
49°
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 59° to 71°, with overnight lows between 45° and 56°. The average high for September is 67° with an average low of 52°. 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.
