S
M
T
W
T
F
S
30
84°
52°
31
76°
53°
1
76°
59°
2
79°
56°
3
80°
60°
4
82°
55°
5
82°
50°
6
74°
50°
7
75°
49°
8
74°
49°
9
74°
56°
10
76°
49°
11
75°
47°
12
72°
46°
13
73°
47°
14
72°
54°
15
73°
46°
16
71°
46°
17
70°
44°
18
69°
44°
19
69°
45°
20
70°
45°
21
69°
46°
22
69°
46°
23
72°
50°
24
74°
49°
25
74°
52°
26
75°
48°
27
75°
41°
28
66°
49°
29
66°
49°
30
73°
44°
1
69°
48°
2
70°
47°
3
65°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Clarklake
Clarklake's September 2026 forecast shows daily high temperatures ranging from 65° to 84°, with overnight lows between 40° and 60°. The average high for September is 73° with an average low of 49°. 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 Clarklake. See also: October | November | December.
