S
M
T
W
T
F
S
30
50°
26°
31
50°
25°
1
49°
26°
2
49°
22°
3
48°
22°
4
45°
21°
5
41°
16°
6
40°
22°
7
41°
21°
8
46°
25°
9
48°
26°
10
39°
18°
11
37°
21°
12
39°
22°
13
45°
25°
14
47°
26°
15
48°
22°
16
40°
16°
17
37°
19°
18
41°
21°
19
37°
15°
20
37°
18°
21
Hist. Avg.
68°
48°
22
Hist. Avg.
68°
47°
23
Hist. Avg.
67°
47°
24
Hist. Avg.
67°
47°
25
Hist. Avg.
67°
47°
26
Hist. Avg.
66°
47°
27
Hist. Avg.
66°
47°
28
Hist. Avg.
66°
46°
29
Hist. Avg.
65°
46°
30
Hist. Avg.
65°
46°
1
Hist. Avg.
65°
46°
2
Hist. Avg.
64°
46°
3
Hist. Avg.
64°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mount Baker
Mount Baker's September 2026 forecast shows daily high temperatures ranging from 37° to 50°, with overnight lows between 15° and 26°. The average high for September is 43° with an average low of 22°. 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.
