S
M
T
W
T
F
S
30
94°
55°
31
93°
54°
1
93°
55°
2
92°
57°
3
93°
56°
4
93°
53°
5
91°
51°
6
88°
49°
7
85°
53°
8
87°
54°
9
90°
54°
10
90°
55°
11
91°
53°
12
86°
53°
13
89°
50°
14
90°
51°
15
85°
49°
16
83°
48°
17
86°
50°
18
89°
51°
19
89°
52°
20
88°
51°
21
88°
52°
22
82°
50°
23
80°
46°
24
82°
49°
25
81°
45°
26
81°
45°
27
80°
43°
28
78°
43°
29
79°
44°
30
78°
45°
1
78°
52°
2
83°
50°
3
85°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Clearlake Oaks
Clearlake Oaks's September 2026 forecast shows daily high temperatures ranging from 78° to 94°, with overnight lows between 43° and 57°. The average high for September is 86° with an average low of 50°. 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 Clearlake Oaks. See also: October | November | December.
