S
M
T
W
T
F
S
30
106°
89°
31
100°
85°
1
101°
84°
2
102°
82°
3
100°
82°
4
102°
83°
5
102°
82°
6
92°
79°
7
98°
78°
8
108°
80°
9
110°
88°
10
113°
88°
11
106°
81°
12
104°
81°
13
106°
80°
14
105°
77°
15
102°
75°
16
102°
71°
17
104°
72°
18
105°
71°
19
109°
70°
20
106°
64°
21
96°
70°
22
95°
68°
23
91°
67°
24
88°
68°
25
92°
57°
26
94°
60°
27
99°
65°
28
96°
65°
29
94°
64°
30
97°
64°
1
100°
63°
2
100°
63°
3
98°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alamo Lake
Alamo Lake's September 2026 forecast shows daily high temperatures ranging from 88° to 109°, with overnight lows between 57° and 81°. The average high for September is 100° with an average low of 69°. 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 Lake. See also: October | November | December.
