S
M
T
W
T
F
S
26
59°
46°
27
59°
47°
28
58°
47°
29
59°
46°
30
59°
47°
31
58°
47°
1
59°
45°
2
58°
44°
3
58°
44°
4
59°
47°
5
58°
47°
6
58°
46°
7
59°
47°
8
58°
47°
9
59°
46°
10
59°
47°
11
60°
47°
12
59°
46°
13
58°
46°
14
59°
47°
15
58°
46°
16
59°
46°
17
61°
46°
18
59°
45°
19
59°
42°
20
60°
44°
21
59°
45°
22
60°
43°
23
61°
43°
24
58°
42°
25
58°
44°
26
59°
44°
27
59°
43°
28
60°
43°
29
57°
42°
30
57°
44°
31
58°
41°
1
58°
42°
2
57°
43°
3
58°
44°
4
59°
43°
5
59°
43°
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 57° to 61°, with overnight lows between 41° and 47°. The average high for August is 59° with an average low of 45°. 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.
