S
M
T
W
T
F
S
26
85°
55°
27
85°
55°
28
84°
54°
29
86°
55°
30
85°
55°
31
84°
54°
1
87°
55°
2
88°
56°
3
88°
55°
4
85°
55°
5
85°
54°
6
86°
55°
7
88°
55°
8
87°
56°
9
88°
54°
10
82°
47°
11
81°
48°
12
82°
49°
13
86°
47°
14
88°
51°
15
87°
53°
16
88°
53°
17
88°
52°
18
89°
53°
19
89°
53°
20
87°
52°
21
88°
52°
22
87°
51°
23
86°
51°
24
86°
50°
25
85°
51°
26
86°
51°
27
86°
50°
28
83°
51°
29
82°
50°
30
81°
44°
31
79°
44°
1
80°
45°
2
79°
42°
3
78°
43°
4
77°
42°
5
77°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Mount Shasta
Mount Shasta's August 2026 forecast shows daily high temperatures ranging from 77° to 89°, with overnight lows between 42° and 56°. The average high for August is 85° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Mount Shasta. See also: September | October | November.
