S
M
T
W
T
F
S
30
71°
55°
31
76°
54°
1
66°
57°
2
70°
55°
3
68°
53°
4
70°
53°
5
70°
52°
6
74°
53°
7
70°
57°
8
74°
55°
9
78°
54°
10
71°
56°
11
67°
52°
12
66°
53°
13
60°
54°
14
69°
56°
15
65°
53°
16
76°
53°
17
76°
53°
18
76°
54°
19
70°
53°
20
72°
54°
21
73°
55°
22
71°
53°
23
67°
52°
24
69°
53°
25
69°
53°
26
68°
54°
27
65°
50°
28
63°
50°
29
62°
51°
30
62°
47°
1
63°
47°
2
61°
48°
3
61°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Baker
Mount Baker's September 2026 forecast shows daily high temperatures ranging from 61° to 76°, with overnight lows between 45° and 56°. The average high for September is 68° 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 Mount Baker. See also: October | November | December.
