S
M
T
W
T
F
S
30
75°
35°
31
76°
39°
1
69°
44°
2
59°
43°
3
58°
46°
4
57°
42°
5
64°
42°
6
64°
42°
7
65°
35°
8
68°
42°
9
73°
43°
10
71°
41°
11
71°
39°
12
70°
40°
13
72°
39°
14
71°
40°
15
74°
36°
16
76°
40°
17
76°
40°
18
67°
39°
19
67°
36°
20
69°
37°
21
74°
40°
22
75°
39°
23
72°
39°
24
69°
38°
25
66°
37°
26
71°
38°
27
73°
39°
28
73°
39°
29
72°
38°
30
71°
38°
1
72°
39°
2
72°
38°
3
71°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Lake Tahoe
South Lake Tahoe's September 2026 forecast shows daily high temperatures ranging from 57° to 76°, with overnight lows between 35° and 46°. The average high for September is 69° with an average low of 39°. 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 South Lake Tahoe. See also: October | November | December.
