S
M
T
W
T
F
S
30
81°
66°
31
87°
67°
1
87°
62°
2
87°
66°
3
87°
70°
4
90°
71°
5
82°
67°
6
73°
67°
7
78°
66°
8
81°
65°
9
83°
56°
10
80°
52°
11
83°
52°
12
73°
51°
13
70°
47°
14
69°
51°
15
70°
52°
16
75°
46°
17
69°
63°
18
73°
61°
19
67°
60°
20
69°
58°
21
60°
51°
22
61°
51°
23
71°
42°
24
66°
51°
25
68°
57°
26
62°
57°
27
64°
57°
28
72°
57°
29
68°
52°
30
73°
65°
1
67°
43°
2
66°
38°
3
73°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Clear Lake
Clear Lake's September 2026 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 Clear Lake. See also: October | November | December.
