S
M
T
W
T
F
S
30
94°
66°
31
96°
69°
1
97°
71°
2
98°
69°
3
99°
72°
4
100°
72°
5
101°
71°
6
101°
73°
7
93°
69°
8
95°
76°
9
98°
74°
10
96°
70°
11
88°
67°
12
94°
71°
13
94°
73°
14
95°
72°
15
90°
66°
16
86°
65°
17
87°
64°
18
83°
61°
19
81°
59°
20
82°
59°
21
81°
58°
22
84°
63°
23
84°
63°
24
85°
64°
25
85°
65°
26
84°
64°
27
84°
63°
28
83°
63°
29
84°
64°
30
84°
63°
1
81°
58°
2
76°
53°
3
71°
50°
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 71° to 98°, with overnight lows between 50° and 76°. The average high for September is 86° with an average low of 64°. 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.
