S
M
T
W
T
F
S
26
88°
56°
27
89°
58°
28
91°
55°
29
90°
53°
30
92°
51°
31
95°
59°
1
93°
52°
2
78°
49°
3
81°
51°
4
90°
55°
5
92°
57°
6
93°
59°
7
97°
58°
8
95°
59°
9
93°
60°
10
93°
58°
11
92°
59°
12
91°
59°
13
85°
54°
14
87°
58°
15
86°
57°
16
86°
57°
17
82°
55°
18
86°
58°
19
86°
59°
20
85°
58°
21
85°
58°
22
84°
57°
23
85°
59°
24
84°
58°
25
84°
58°
26
83°
57°
27
84°
58°
28
84°
57°
29
83°
56°
30
79°
56°
31
80°
55°
1
82°
56°
2
83°
57°
3
82°
56°
4
81°
56°
5
81°
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 78° to 97°, with overnight lows between 49° and 60°. The average high for August is 86° with an average low of 57°. 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.
