S
M
T
W
T
F
S
26
74°
54°
27
62°
49°
28
55°
44°
29
65°
40°
30
72°
50°
31
70°
50°
1
62°
46°
2
70°
45°
3
64°
54°
4
57°
54°
5
59°
54°
6
58°
53°
7
62°
52°
8
64°
49°
9
60°
49°
10
66°
53°
11
66°
50°
12
56°
52°
13
57°
53°
14
56°
53°
15
60°
48°
16
59°
53°
17
69°
49°
18
57°
51°
19
54°
51°
20
59°
52°
21
59°
47°
22
56°
47°
23
65°
47°
24
64°
53°
25
65°
41°
26
62°
45°
27
64°
44°
28
58°
42°
29
59°
43°
30
59°
42°
31
56°
42°
1
57°
41°
2
59°
43°
3
58°
41°
4
55°
44°
5
54°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Port O'Brien
Port O'Brien's August 2026 forecast shows daily high temperatures ranging from 54° to 65°, with overnight lows between 41° and 53°. The average high for August is 59° with an average low of 44°. 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 Port O'Brien. See also: September | October | November.
