S
M
T
W
T
F
S
26
68°
53°
27
69°
53°
28
65°
50°
29
65°
49°
30
64°
52°
31
65°
53°
1
66°
52°
2
65°
51°
3
65°
51°
4
66°
50°
5
65°
54°
6
68°
53°
7
68°
53°
8
67°
52°
9
68°
53°
10
68°
53°
11
69°
52°
12
70°
53°
13
69°
52°
14
69°
53°
15
69°
52°
16
68°
51°
17
68°
50°
18
68°
50°
19
69°
49°
20
69°
51°
21
68°
50°
22
68°
51°
23
69°
52°
24
68°
50°
25
67°
50°
26
63°
46°
27
64°
48°
28
63°
50°
29
64°
49°
30
63°
48°
31
63°
47°
1
64°
47°
2
62°
48°
3
62°
48°
4
63°
46°
5
63°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Castle Douglas
Castle Douglas's August 2026 forecast shows daily high temperatures ranging from 62° to 70°, with overnight lows between 44° and 54°. The average high for August is 66° with an average low of 50°. 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 Castle Douglas. See also: September | October | November.
