S
M
T
W
T
F
S
26
88°
76°
27
87°
77°
28
88°
77°
29
90°
76°
30
89°
77°
31
90°
77°
1
92°
76°
2
92°
77°
3
90°
77°
4
90°
76°
5
91°
77°
6
91°
77°
7
90°
76°
8
89°
76°
9
90°
77°
10
91°
77°
11
90°
76°
12
89°
77°
13
90°
76°
14
89°
76°
15
90°
75°
16
87°
76°
17
87°
76°
18
88°
77°
19
87°
77°
20
87°
76°
21
88°
77°
22
88°
77°
23
89°
76°
24
89°
74°
25
90°
75°
26
88°
74°
27
89°
75°
28
88°
74°
29
89°
75°
30
89°
74°
31
91°
75°
1
90°
75°
2
90°
74°
3
89°
75°
4
90°
76°
5
90°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Port St. John
Port St. John's August 2026 forecast shows daily high temperatures ranging from 87° to 92°, with overnight lows between 74° and 77°. The average high for August is 89° with an average low of 76°. 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 St. John. See also: September | October | November.
