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°
55°
18
71°
53°
19
60°
54°
20
68°
50°
21
62°
48°
22
63°
48°
23
64°
47°
24
69°
49°
25
68°
48°
26
69°
46°
27
68°
46°
28
67°
49°
29
70°
50°
30
70°
47°
1
68°
42°
2
62°
47°
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 60° to 71°, with overnight lows between 42° and 54°. The average high for September is 66° with an average low of 48°. 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.
