S
M
T
W
T
F
S
30
76°
60°
31
79°
61°
1
80°
61°
2
80°
60°
3
79°
61°
4
79°
61°
5
78°
60°
6
76°
60°
7
72°
56°
8
72°
55°
9
77°
59°
10
78°
60°
11
69°
52°
12
74°
59°
13
78°
61°
14
80°
60°
15
76°
60°
16
77°
59°
17
77°
60°
18
76°
59°
19
75°
52°
20
74°
54°
21
73°
57°
22
74°
52°
23
69°
47°
24
67°
47°
25
66°
48°
26
68°
51°
27
72°
54°
28
72°
53°
29
73°
55°
30
71°
50°
1
69°
52°
2
69°
53°
3
70°
50°
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 66° to 80°, with overnight lows between 47° and 61°. The average high for September is 74° with an average low of 56°. 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.
