S
M
T
W
T
F
S
26
95°
70°
27
97°
70°
28
84°
64°
29
90°
64°
30
88°
66°
31
73°
63°
1
84°
61°
2
82°
61°
3
86°
61°
4
77°
59°
5
79°
54°
6
81°
52°
7
81°
63°
8
82°
55°
9
84°
63°
10
84°
66°
11
88°
66°
12
88°
68°
13
81°
66°
14
82°
64°
15
82°
66°
16
82°
59°
17
86°
55°
18
84°
61°
19
81°
52°
20
81°
50°
21
81°
61°
22
81°
59°
23
81°
46°
24
81°
50°
25
79°
63°
26
81°
58°
27
83°
55°
28
84°
65°
29
79°
68°
30
87°
72°
31
91°
62°
1
88°
64°
2
85°
65°
3
84°
64°
4
84°
63°
5
79°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Frontenac
Frontenac's August 2026 forecast shows daily high temperatures ranging from 79° to 91°, with overnight lows between 55° and 72°. The average high for August is 84° with an average low of 64°. 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 Frontenac. See also: September | October | November.
