S
M
T
W
T
F
S
26
89°
59°
27
90°
55°
28
88°
52°
29
83°
55°
30
82°
54°
31
80°
49°
1
79°
50°
2
80°
52°
3
80°
53°
4
82°
59°
5
89°
60°
6
90°
60°
7
85°
61°
8
90°
53°
9
83°
49°
10
80°
51°
11
82°
51°
12
84°
53°
13
82°
52°
14
80°
53°
15
87°
49°
16
87°
53°
17
86°
57°
18
87°
54°
19
78°
55°
20
76°
49°
21
76°
47°
22
77°
47°
23
75°
48°
24
77°
47°
25
81°
48°
26
83°
53°
27
82°
48°
28
73°
46°
29
72°
44°
30
74°
45°
31
76°
50°
1
75°
49°
2
72°
47°
3
73°
46°
4
72°
44°
5
72°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Castlegar
Castlegar's August 2026 forecast shows daily high temperatures ranging from 72° to 90°, with overnight lows between 44° and 61°. The average high for August is 81° 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 Castlegar. See also: September | October | November.
