S
M
T
W
T
F
S
30
72°
48°
31
73°
45°
1
79°
45°
2
78°
48°
3
79°
50°
4
79°
48°
5
71°
46°
6
70°
42°
7
69°
40°
8
71°
46°
9
74°
49°
10
77°
50°
11
78°
39°
12
70°
44°
13
67°
47°
14
68°
35°
15
74°
35°
16
65°
34°
17
61°
32°
18
61°
33°
19
62°
41°
20
63°
39°
21
69°
34°
22
63°
35°
23
60°
32°
24
59°
30°
25
58°
30°
26
59°
32°
27
59°
32°
28
58°
36°
29
59°
35°
30
66°
40°
1
Hist. Avg.
62°
38°
2
Hist. Avg.
62°
37°
3
Hist. Avg.
61°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alamo
Alamo's September 2026 forecast shows daily high temperatures ranging from 58° to 79°, with overnight lows between 30° and 50°. The average high for September is 68° with an average low of 40°. 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 Alamo. See also: October | November | December.
