S
M
T
W
T
F
S
30
96°
57°
31
90°
57°
1
72°
57°
2
66°
60°
3
63°
55°
4
76°
49°
5
82°
58°
6
83°
54°
7
89°
64°
8
94°
54°
9
104°
57°
10
98°
70°
11
95°
57°
12
90°
59°
13
83°
52°
14
90°
64°
15
90°
53°
16
82°
56°
17
77°
55°
18
90°
52°
19
95°
57°
20
92°
59°
21
92°
59°
22
85°
59°
23
89°
58°
24
87°
59°
25
81°
61°
26
81°
53°
27
82°
59°
28
87°
61°
29
88°
60°
30
84°
59°
1
82°
60°
2
85°
59°
3
83°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Shasta Lake
Shasta Lake's September 2026 forecast shows daily high temperatures ranging from 81° to 89°, with overnight lows between 53° and 62°. The average high for September is 85° with an average low of 59°. 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 Shasta Lake. See also: October | November | December.
