S
M
T
W
T
F
S
30
80°
59°
31
83°
60°
1
79°
60°
2
82°
61°
3
79°
59°
4
76°
61°
5
78°
63°
6
84°
63°
7
79°
63°
8
83°
62°
9
80°
59°
10
78°
59°
11
75°
58°
12
76°
59°
13
77°
57°
14
72°
47°
15
78°
50°
16
77°
52°
17
77°
52°
18
76°
51°
19
76°
51°
20
76°
50°
21
76°
50°
22
75°
49°
23
75°
50°
24
74°
50°
25
74°
49°
26
70°
48°
27
65°
49°
28
66°
48°
29
64°
46°
30
64°
47°
1
65°
46°
2
67°
45°
3
67°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Los Alamos
Los Alamos's September 2026 forecast shows daily high temperatures ranging from 64° to 84°, with overnight lows between 45° and 63°. The average high for September is 75° with an average low of 53°. 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 Los Alamos. See also: October | November | December.
