S
M
T
W
T
F
S
30
74°
48°
31
74°
49°
1
75°
52°
2
74°
51°
3
74°
49°
4
73°
51°
5
74°
49°
6
72°
47°
7
78°
53°
8
78°
51°
9
77°
52°
10
76°
52°
11
75°
50°
12
75°
47°
13
72°
48°
14
74°
44°
15
69°
45°
16
69°
45°
17
70°
46°
18
76°
47°
19
75°
44°
20
74°
40°
21
Hist. Avg.
72°
48°
22
Hist. Avg.
72°
47°
23
Hist. Avg.
72°
47°
24
Hist. Avg.
71°
46°
25
Hist. Avg.
71°
46°
26
Hist. Avg.
71°
46°
27
Hist. Avg.
70°
45°
28
Hist. Avg.
70°
45°
29
Hist. Avg.
70°
44°
30
Hist. Avg.
69°
44°
1
Hist. Avg.
69°
44°
2
Hist. Avg.
68°
43°
3
Hist. Avg.
68°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Los Alamos
Los Alamos's September 2026 forecast shows daily high temperatures ranging from 69° to 78°, with overnight lows between 40° and 53°. The average high for September is 74° with an average low of 48°. 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.
