S
M
T
W
T
F
S
30
85°
65°
31
84°
69°
1
92°
67°
2
89°
70°
3
78°
65°
4
79°
68°
5
79°
63°
6
79°
51°
7
79°
51°
8
80°
53°
9
82°
69°
10
78°
50°
11
77°
45°
12
86°
52°
13
74°
46°
14
70°
40°
15
74°
56°
16
73°
60°
17
69°
54°
18
69°
48°
19
62°
56°
20
71°
49°
21
62°
45°
22
63°
45°
23
65°
47°
24
64°
46°
25
68°
46°
26
72°
45°
27
72°
46°
28
67°
47°
29
68°
49°
30
67°
47°
1
67°
46°
2
68°
41°
3
61°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lake Isabella
Lake Isabella's September 2026 forecast shows daily high temperatures ranging from 61° to 72°, with overnight lows between 41° and 56°. The average high for September is 66° with an average low of 47°. 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 Lake Isabella. See also: October | November | December.
