S
M
T
W
T
F
S
26
79°
58°
27
79°
59°
28
82°
58°
29
76°
57°
30
79°
59°
31
81°
59°
1
80°
58°
2
81°
58°
3
83°
57°
4
83°
51°
5
78°
49°
6
75°
50°
7
78°
55°
8
80°
54°
9
75°
53°
10
73°
51°
11
76°
57°
12
78°
57°
13
77°
53°
14
76°
49°
15
72°
49°
16
75°
50°
17
77°
50°
18
70°
48°
19
73°
48°
20
74°
49°
21
75°
54°
22
77°
55°
23
79°
55°
24
80°
56°
25
80°
54°
26
78°
55°
27
79°
53°
28
78°
54°
29
77°
53°
30
74°
46°
31
72°
42°
1
67°
45°
2
67°
43°
3
65°
43°
4
66°
44°
5
65°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Chalk River
Chalk River's August 2026 forecast shows daily high temperatures ranging from 65° to 83°, with overnight lows between 42° and 59°. The average high for August is 76° with an average low of 52°. 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 Chalk River. See also: September | October | November.
