S
M
T
W
T
F
S
31
96°
72°
1
90°
74°
2
97°
72°
3
98°
77°
4
100°
69°
5
97°
77°
6
89°
75°
7
78°
71°
8
87°
70°
9
90°
65°
10
92°
69°
11
93°
67°
12
94°
75°
13
93°
71°
14
93°
71°
15
92°
71°
16
92°
71°
17
92°
69°
18
92°
70°
19
93°
71°
20
93°
71°
21
94°
77°
22
95°
77°
23
97°
79°
24
93°
76°
25
92°
74°
26
91°
65°
27
92°
63°
28
91°
64°
29
87°
64°
30
92°
65°
1
93°
65°
2
93°
66°
3
93°
68°
4
90°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alamo Heights
Alamo Heights's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Heights. See also: October | November | December.
