S
M
T
W
T
F
S
30
92°
70°
31
90°
67°
1
88°
65°
2
89°
68°
3
93°
69°
4
92°
69°
5
89°
68°
6
87°
62°
7
88°
68°
8
95°
69°
9
95°
70°
10
96°
70°
11
96°
69°
12
95°
70°
13
95°
69°
14
88°
60°
15
85°
64°
16
87°
66°
17
93°
67°
18
94°
68°
19
93°
66°
20
93°
66°
21
92°
65°
22
93°
66°
23
88°
65°
24
85°
65°
25
90°
64°
26
91°
64°
27
91°
63°
28
84°
61°
29
83°
63°
30
86°
60°
1
82°
54°
2
79°
53°
3
79°
55°
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 79° to 96°, with overnight lows between 53° and 70°. The average high for September is 90° with an average low of 65°. 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.
