S
M
T
W
T
F
S
26
72°
59°
27
72°
54°
28
77°
63°
29
77°
61°
30
72°
48°
31
68°
46°
1
68°
48°
2
72°
48°
3
73°
57°
4
79°
61°
5
68°
57°
6
63°
54°
7
68°
50°
8
81°
50°
9
70°
51°
10
64°
53°
11
74°
59°
12
81°
63°
13
85°
61°
14
71°
57°
15
65°
54°
16
68°
54°
17
67°
55°
18
67°
54°
19
69°
56°
20
71°
55°
21
70°
57°
22
64°
53°
23
65°
51°
24
64°
51°
25
64°
52°
26
63°
51°
27
63°
50°
28
64°
50°
29
63°
49°
30
63°
52°
31
64°
53°
1
63°
54°
2
67°
56°
3
67°
55°
4
65°
53°
5
63°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Castleton
Castleton's August 2026 forecast shows daily high temperatures ranging from 63° to 85°, with overnight lows between 49° and 63°. The average high for August is 67° with an average low of 54°. 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 Castleton. See also: September | October | November.
